A Method for Matching Two-Stage Turbocharger System and Its Influence on Engine Performance

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Binyang Wu ◽  
Zhiqiang Han ◽  
Xiaoyang Yu ◽  
Shunkai Zhang ◽  
Xiaokun Nie ◽  
...  
Keyword(s):  
Entire Range ◽  
High Efficiency ◽  
Pressure Ratio ◽  
Air Flow ◽  
Boost Pressure ◽  
Drive Power ◽  
Two Stage ◽  
Operational Conditions ◽  
Exhaust Heat ◽  
Turbocharging System

Matching of a two-stage turbocharging system is important for high efficiency engines because the turbocharger is the most effective method of exhaust heat recovery. In this study, we propose a method to match a two-stage turbocharging system for high efficiency over the entire range of operational conditions. Air flow is an important parameter because it influences combustion efficiency and heat load performance. First, the thermodynamic parameters of the engine and the turbocharging system are calculated in eight steps for selecting and matching the turbochargers. Then, by designing the intercooler intensity, distribution of pressure ratio, and compressor operational efficiency, it is ensured that the turbochargers not only meet the air flow requirements but also operate with high efficiency. The concept of minimum total drive power of the compressors is introduced at a certain boost pressure. It is found that the distribution of pressure ratio of the high- and low-pressure (LP) turbocharger should be regulated according to the engine speed by varying the rack position of the variable geometry turbocharger (VGT) to obtain the minimum total drive work. It is verified that two-stage turbochargers have high efficiency over the entire range of operational conditions by experimental research. Compared with the original engine torque, low-speed torque is improved by more than 10%, and the engine low fuel consumption area is broadened.

High-Altitude Matching Characteristic of Regulated Two-Stage Turbocharger With Diesel Engine

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Ruilin Liu ◽  
Zhongjie Zhang ◽  
Surong Dong ◽  
Guangmeng Zhou
Keyword(s):  
Diesel Engine ◽  
High Altitude ◽  
Process Model ◽  
High Efficiency ◽  
Pressure Ratio ◽  
Operating Conditions ◽  
Boost Pressure ◽  
Two Stage ◽  
Variable Geometry Turbocharger ◽  
Different Altitudes

To improve engine power at high altitude, the regulated two-stage turbocharger (RTST) which was applied to different altitudes was developed by the authors. The working process model of heavy-duty common-rail diesel engine matched with RTST was built to study the regulating characteristic of variable geometry turbocharger (VGT) vane and both turbine bypass valves and also matching performance of RTST with engine at different altitudes. The control scheme of RTST at different altitudes and engine operating conditions was first put forward, and the optimal opening maps of VGT vane and both turbine bypass valves at different altitudes and engine operating conditions were obtained. The results show that the optimal openings of VGT vane and both turbine bypass valves decrease with increase of altitude, and the optimal opening range of VGT vane becomes narrower with increase of altitude. The operating points of both high-pressure (HP) and low-pressure (LP) compressors locate at high-efficiency region of each compressor map, respectively, and compressor efficiency exceeds 70% at altitude of 5500 m. The total boost pressure ratio increases with altitude and reaches the maximum value of 5.1 at altitude of 5500 m. Compared with single-stage turbocharged engine, the rated power, maximum torque, and torques at lower engine speed at altitude of 5500 m increase by 48.2%, 51%, and 65–121% separately, and the minimum fuel consumption decreases by 12.6%.

scholarly journals Establishment of a Two-Stage Turbocharging System Model and Analysis on Influence Rules of Key Parameters

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1953
Author(s):  
Wei Tian ◽  
Defeng Du ◽  
Juntong Li ◽  
Zhiqiang Han ◽  
Wenbin Yu
Keyword(s):  
Diesel Engine ◽  
Pressure Ratio ◽  
Constraint Equation ◽  
Optimization Method ◽  
Expansion Ratio ◽  
Total Energy Consumption ◽  
Two Stage ◽  
Constraint Equations ◽  
Turbocharging System ◽  
Target Pressure

This paper took a two-stage turbocharged heavy-duty six-cylinder diesel engine as the research object and established a two-stage turbocharging system matching model. The influence rules between the two-stage turbocharging key parameters were analyzed, while summarizing an optimization method of key parameters of a two-stage turbocharger. The constraint equations for the optimal distribution principle of the two-stage turbocharger’s pressure ratio and expansion ratio were proposed. The results show that when the pressure ratio constraint equation and expansion ratio constraint equation are satisfied, the diesel engine can achieve the target pressure ratio, while the total energy consumption of the turbocharger is the lowest.

Aerodesign and Testing of an Aeromechanically Highly Loaded LP Turbine

2003 ◽  
Vol 128 (4) ◽  
pp. 643-649 ◽  
Author(s):  
F. J. Malzacher ◽  
J. Gier ◽  
F. Lippl
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
Pressure Ratio ◽  
Test Facility ◽  
Performance Measurements ◽  
Two Stage ◽  
Low Pressure Turbine ◽  
High Mach ◽  
Lp Turbine ◽  
Compact Geometry

Future turbo systems for aircraft engines need very compact geometry, low weight, and high efficiency components. The geared turbofan enables the engine designer to decouple the speed of the fan and the LP turbine to combine a low speed fan with a high speed LP turbine. The low pressure turbine is a key component for this concept. The technological challenge is very much driven by the very high low-spool speed. Resulting as well from high inlet temperatures, the LP turbine needs cooling of the first stage. A new MTU LPT concept for such a high speed turbine has been developed and tested in a turbine rig. The concept consists of a two-stage turbine for extremely high speed and high stage pressure ratio (ER 2.3). This leads to extra high mechanical loading and an exotic combination of high Mach numbers (transonic) and very low Reynolds numbers. In this paper some design features are described. Some elements of the airfoil design were also tested in additional cascade tests. The two-stage turbine was tested at the Altitude Test Facility of the ILA, Stuttgart. The test setup is described including details of the instrumentation. Test data shows a good turbine performance. Measurements are also compared to 3D CFD, which is used to analyze local effects.

A Matching Method for Two-Stage Turbocharging System

2014 ◽  
Author(s):  
Yanbin Liu ◽  
Weilin Zhuge ◽  
Yangjun Zhang ◽  
Shuyong Zhang ◽  
Junyue Zhang ◽  
...  
Keyword(s):  
Similarity Theory ◽  
Calculation Model ◽  
Two Stage ◽  
Ratio Distribution ◽  
Operational Conditions ◽  
Low Pressure Turbine ◽  
Flow Capacity ◽  
Characteristic Lines ◽  
Turbocharging System ◽  
Compressor Map

The turbine system of a two-stage turbocharger composed of high pressure turbine, low pressure turbine and by-pass valve decides distribution and utilization of exhaust gas energy and influence performance of two-stage turbocharger in whole operational conditions. Besides, characteristics of turbine is expressed by envelop line of characteristic lines in different speeds. So turbine can be conveniently selected compared with compressor with similarity theory. Therefore two-stage turbocharger matching begins from turbine system matching in the paper. In two-stage turbocharger, cooler efficiency, cooler loss and by-pass valve open besides turbochargers will influence turbocharging system performance and design of cooler and by-pass valve are important contents of turbocharging system matching. The paper matched inter cooler, by-pass valve open, compressors and turbines jointly. Calculation model for turbocharger matching was built, and turbine performance is get from reference turbine based on similarity theory; influence of compressor ratio distribution, cooler efficiency and pressure drop in cooler imposing on compressor work was analyzed; and influence of turbine flow capacity and by-pass valve imposing on output working in expanding process was studied; the method for matching of two-stage turbocharging system in whole operational condition is studied Matching analysis was made aiming at two-stage turbocharging system of a type of high power density diesel engine, and design for turbocharging system was finished. Matching result using the method is compared to matching result using traditional method. Analysis result proves that using the method matching points in different operational conditions are located in more reasonable zone of compressor MAP.

A Matching Method for Two-Stage Turbocharging System

2014 ◽  
Vol 137 (2) ◽  
Author(s):  
Liu Yanbin ◽  
Zhuge Weilin ◽  
Zhang Yangjun ◽  
Zhang Shuyong ◽  
Zhang Junyue ◽  
...  
Keyword(s):  
Similarity Theory ◽  
Calculation Model ◽  
Two Stage ◽  
Ratio Distribution ◽  
Operational Conditions ◽  
Low Pressure Turbine ◽  
Flow Capacity ◽  
Characteristic Lines ◽  
Turbocharging System ◽  
Compressor Map

The turbine system of a two-stage turbocharger composed of high pressure turbine (HT), low pressure turbine (LT), and by-pass valve decides distribution and utilization of exhaust gas energy and influence performance of two-stage turbocharger in whole operational conditions. Besides, characteristics of turbine is expressed by envelop line of characteristic lines in different speeds. So turbine can be conveniently selected compared with compressor with similarity theory. Therefore, two-stage turbocharger matching begins from turbine system matching in the paper. In two-stage turbocharger, cooler efficiency, cooler loss, and by-pass valve open besides turbochargers will influence turbocharging system performance and design of cooler and by-pass valve are important contents of turbocharging system matching. The paper matched intercooler, by-pass valve open, compressors, and turbines jointly. Calculation model for turbocharger matching was built, and turbine performance is get from reference turbine based on similarity theory; influence of compressor ratio distribution, cooler efficiency, and pressure drop in cooler imposing on compressor work was analyzed; and influence of turbine flow capacity and by-pass valve imposing on output working in expanding process was studied; the method for matching of two-stage turbocharging system in whole operational condition is studied. Matching analysis was made aiming at two-stage turbocharging system of a type of high power density diesel engine, and design for turbocharging system was finished. Matching result using the method is compared to matching result using traditional method. Analysis result proves that using the method matching points in different operational conditions are located in more reasonable zone of compressor MAP.

scholarly journals SIMULATION OF A TURBOCHARGING SYSTEM EQUIPPED FOR A DIESEL ENGINE D1146TIS

2009 ◽  
Vol 12 (14) ◽  
pp. 86-94
Author(s):  
Tuan Anh Le
Keyword(s):  
Diesel Engine ◽  
High Efficiency ◽  
Simulation Software ◽  
Boost Pressure ◽  
Load Curve ◽  
Ic Engine ◽  
Research Activities ◽  
University Of Technology ◽  
Turbocharging System ◽  
Dimensional Simulation

The paper presents simulated results of a turbocharging system in a combination of turbine - compressor - IC. engine on one dimensional simulation software AVL-BOOST. Findings of the research depict clearly that the turbocharger equipped for the engine has met all requirements to have high boost pressure for this engine. The full load curve of the engine is located out of the surge area and in the area of high efficiency of the compressor's map. Besides, findings of the research also virtually show the matching of the turbochager and the engine - an important basis for operating the turbocharged engine with highest efficiency. It is a part of the collaborative research activities on developing a new type of high tuborcharged IC. diesel engine between Hanoi University of Technology (HUT) and Vietnam Engine and Agricultural Machinary Corporation (VEAM).

scholarly journals Gas turbine intake air hybrid cooling systems and their rational designing

2021 ◽  
Vol 323 ◽  
pp. 00030
Author(s):  
Mykola Radchenko ◽  
Andrii Radchenko ◽  
Dariusz Mikielewicz ◽  
Krzysztof Kosowski ◽  
Serhiy Kantor ◽  
...  
Keyword(s):  
Gas Turbines ◽  
High Efficiency ◽  
Fuel Efficiency ◽  
Lithium Bromide ◽  
Cooling Capacity ◽  
Climatic Conditions ◽  
Air Cooling ◽  
Two Stage ◽  
Ambient Temperatures ◽  
Exhaust Heat

The general trend to improve the fuel efficiency of gas turbines (GT) at increased ambient temperatures is turbine intake air cooling (TIAC) by exhaust heat recovery chillers The high efficiency absorption lithium-bromide chillers (ACh) of a simple cycle are the most widely used, but they are not able to cool intake air lower than 15°C because of a chilled water temperature of about 7°C. A two-stage hybrid absorption-ejector chillers (AECh) were developed with ejector chiller as a low temperature stage to provide deep air cooling to 10°C and lower. A novel trend in TIAC by two-stage air cooling in chillers of hybrid type has been proposed to provide about 50% higher annual fuel saving in temperate climatic conditions as compared with ACh cooling. The advanced methodology to design and rational distribute the cooling capacity of TIAC systems that provides a closed to maximum annual fuel reduction without oversizing was developed.

Aerodynamic interaction of turbines in a regulated two-stage turbocharging system

2021 ◽  
pp. 095440702110647
Author(s):  
Mingyang Yang ◽  
Lei Pan ◽  
Mengying Shu ◽  
Kangyao Deng ◽  
Zhanming Ding ◽  
...  
Keyword(s):  
Entropy Generation ◽  
Internal Combustion Engines ◽  
Swirling Flow ◽  
Flow Analysis ◽  
Low Pressure ◽  
Two Stage ◽  
Operational Conditions ◽  
Low Pressure Turbine ◽  
Bypass Valve ◽  
Turbocharging System

Two-stage turbocharging becomes prevailing in internal combustion engines due to its advantage of flexibility of boosting for the variation of operational conditions. Two turbochargers are closely coupled by engine manifolds in the system especially under the requirement of compactness. This paper studies the influence of the interaction of two turbines in a two-stage turbocharging system on the performance. Results show that the performance of low-pressure turbine is highly sensitive to the stage interaction. Specifically, compared with the cases without interaction, the efficiency of low-pressure turbine increases maximumly by 2.8% when the bypass valve is closed, but reduces drastically by 7.5% when the valve is open. Detailed flow analysis shows that the combined results of swirling flow from the high-pressure turbine and the Dean vortex caused by the manifold elbow result in the alleviation of entropy generation in the turbine rotor. However, when the bypass valve is open, interaction of the swirling flow with the injected bypass flow results in strong secondary flow in the volute and distorted inlet flow condition for the rotor, leading to the enhancement of entropy generation in low-pressure turbine. The study provides valuable insights into turbine performance in a two-stage turbocharging system, which can be used for the modeling and optimization of multi-stage turbocharging systems.

scholarly journals Research on the Power Recovery of Diesel Engines with Regulated Two-Stage Turbocharging System at Different Altitudes

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Hualei Li ◽  
Lei Shi ◽  
Kangyao Deng
Keyword(s):  
Diesel Engines ◽  
Control Strategies ◽  
Pressure Recovery ◽  
Boost Pressure ◽  
Two Stage ◽  
Bypass Valve ◽  
Turbocharging System ◽  
Power Recovery ◽  
Valve Control ◽  
Different Altitudes

Recovering the boost pressure is very important in improving the dynamic performance of diesel engines at high altitudes. A regulated two-stage turbocharging system is an adequate solution for power recovery of diesel engines. In the present study, the change of boost pressure and engine power at different altitudes was investigated, and a regulated two-stage turbocharging system was constructed with an original turbocharger and a matched low pressure turbocharger. The valve control strategies for boost pressure recovery, which formed the basis of the power recovery method, are presented here. The simulation results showed that this system was effective in recovering the boost pressure at different speeds and various altitudes. The turbine bypass valve and compressor bypass valve had different modes to adapt to changes in operating conditions. The boost pressure recovery could not ensure power recovery over the entire operating range of the diesel engine, because of variation in overall turbocharger efficiency. The fuel-injection compensation method along with the valve control strategies for boost pressure recovery was able to reach the power recovery target.

Sign in / Sign up

Export Citation Format

Share Document