Equivalent turbocharger model of regulated two-stage turbocharging system

2010 ◽  
Vol 83 (4) ◽  
pp. 195-201 ◽  
Author(s):  
B Liu ◽  
K Y Deng ◽  
Y Cui
Keyword(s):  
Two Stage ◽  
Turbocharging System

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.

Equivalent matching model of a regulated two-stage turbocharging system for the plateau adaptability

2016 ◽  
Vol 230 (12) ◽  
pp. 1654-1669 ◽  
Author(s):  
Hualei Li ◽  
Guozheng Zhang ◽  
Huiyan Zhang ◽  
Lei Shi ◽  
Mingyang Yang ◽  
...  
Keyword(s):  
Matching Model ◽  
Two Stage ◽  
Turbocharging System

Two-Stage Turbocharging Solutions for Tier 4 Rail Applications

2015 ◽  
Author(s):  
Simone Bernasconi ◽  
Ennio Codan ◽  
David Yang ◽  
Pierre Jacoby ◽  
German Weisser
Keyword(s):  
Catalytic Reduction ◽  
Fuel Efficiency ◽  
Engine Performance ◽  
Ambient Conditions ◽  
Two Stage ◽  
Optimum Performance ◽  
Engine Model ◽  
High Fuel Efficiency ◽  
Wide Range ◽  
Turbocharging System

With the introduction of the EPA Tier 4 NOx emission limits for rail diesel engines this year, engine developers are forced to implement more advanced emission control technologies such as selective catalytic reduction (SCR) or cooled external exhaust gas recirculation (EGR). The integration and control of these systems for ensuring optimum performance throughout the operating range brings about new challenges on top of the well-known requirement for unconstrained operability in a very wide range of conditions. As a consequence, engines and their subsystems have to be designed for maximum flexibility. The turbocharging system in particular needs to be capable of dealing with extreme ambient conditions associated with high altitudes, hot summers, severe winters, tunnel operation, etc. This flexibility must be achieved without compromising reliability and while ensuring continuous in-use compliance with the emissions standards throughout the life of the installation. At the same time, engine performance should be maintained at the highest level possible. This study demonstrates that all of these targets can be met by combining two-stage turbocharging and EGR with suitable control elements. Two-stage turbocharging, which has become increasingly popular in other industry sectors due to its potential for improving the bsfc / NOx emissions trade-off when used in combination with correspondingly optimized valve actuation (Miller timing), is starting to be adopted also for rail applications. A variety of EGR concepts was proposed or put into practice over the past few years, and the most important or promising of these have been taken into consideration for this study. Extensive simulations of the resulting engine and turbocharging systems have been performed using ABB’s in-house simulation platform, based on a generic engine model that can be considered representative of the rail sector. It is shown that integration of EGR, two-stage turbocharging and appropriate control elements is highly attractive as it offers outstanding operational flexibility and very high fuel efficiency without any compromise in terms of reliability. The selection and specification of control elements and turbocharging system components depends on the EGR concept applied. As is shown below, this can be tailored to the application to ensure optimum performance and flexibility. In view of these obvious benefits, we are very confident that such integrated EGR / two-stage turbocharging systems will be adopted more widely on railway engines.

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.

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.

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