Statistically Optimized Performance Predictions of Low Heat Rejection Engines with Exhaust Energy Recovery

1986 ◽  
Author(s):  
Mustafa N. Savliwala ◽  
Nabil S. Hakim
Keyword(s):  
Energy Recovery ◽  
Heat Rejection ◽  
Performance Predictions ◽  
Exhaust Energy

Numerical and experimental investigation of exhaust manifold configurations of turbo-charged diesel engines

2020 ◽  
pp. 095765092097030
Author(s):  
Sheng Liu ◽  
Weilin Zhuge ◽  
Yangjun Zhang
Keyword(s):  
Flow Field ◽  
Pipe Flow ◽  
Energy Recovery ◽  
Fuel Efficiency ◽  
Branch Pipe ◽  
Exhaust Gas ◽  
Available Energy ◽  
Pulse Converter ◽  
Flow Loss ◽  
Exhaust Energy

The exhaust energy recovery is significant for engine fuel efficiency. However, the exhaust gas interference and the loss of flow affect the utilization of exhaust energy of multi cylinder turbocharged diesel engine seriously. In this paper, through Particle Image Velocimetry experiment and computational fluid dynamics simulation of exhaust T-junction flow field, the characteristics of junction local flow field and the law of energy loss are obtained. Based on the one dimensional simulation of engine working process, the exhaust available energy analysis is carried out, and the transmission of available energy of exhaust valve and various pipe systems under typical operating conditions is obtained. On this basis, five exhaust systems are designed, and the steady-state and transient performances are compared by bench tests. The results show that the shrinkage rate and the intersection angle of T-junction are the key factors affecting exhaust energy transmission and exhaust gas interference suppression. Reducing the branch pipe shrinkage rate leads to an increase in branch pipe flow loss, but it will also reduce the main pipe flow loss and exhaust gas interference. Reducing the angle between the main pipe and branch pipe is beneficial to the exhaust flow and exhaust energy recovery. The pulse converter exhaust system has a high exhaust available energy transmission rate; the Modular Pulse Converter system has superior fuel efficiency and transient response performance from the perspective of the entire engine operation range. The 90% response time difference between the five studied exhaust systems is about 0.41 s.

scholarly journals Exhaust Energy Recovery with Variable Geometry Turbine to Reduce Fuel Consumption for Microcars

2018 ◽  
Author(s):  
Fernando Ortenzi ◽  
Antonino Genovese ◽  
Martina Carrazza ◽  
Franco Rispoli ◽  
Paolo Venturini
Keyword(s):  
Fuel Consumption ◽  
Energy Recovery ◽  
Variable Geometry ◽  
Reduce Fuel Consumption ◽  
Variable Geometry Turbine ◽  
Exhaust Energy

A new approach for exhaust energy recovery of internal combustion engine: Steam turbocharging

2013 ◽  
Vol 52 (1) ◽  
pp. 150-159 ◽  
Author(s):  
Jianqin Fu ◽  
Jingping Liu ◽  
Yanping Yang ◽  
Chengqin Ren ◽  
Guohui Zhu
Keyword(s):  
Internal Combustion Engine ◽  
Energy Recovery ◽  
Combustion Engine ◽  
Internal Combustion ◽  
New Approach ◽  
Exhaust Energy

Rotary Stirling Engine for Exhaust Energy Recovery

2011 ◽  
Vol 347-353 ◽  
pp. 3193-3196
Author(s):  
Yu Chung Liao ◽  
Shen Tsao Hung ◽  
Jau Huai Lu
Keyword(s):  
Output Power ◽  
Compression Ratio ◽  
Energy Recovery ◽  
Heating Temperature ◽  
Maximum Output Power ◽  
Stirling Engine ◽  
Maximum Output ◽  
Eccentric Cylinders ◽  
New Type ◽  
Exhaust Energy

A new type of rotary Stirling engine for exhaust energy recovery is introduced in this paper. This engine is constructed by two eccentric cylinders with displaced centers. The space between these two circles is divided into four chambers. The outside cylinder is stationary while the inside cylinder rotates at a constant speed. The volume of each chamber would vary during the rotation. Part of the wall of the outside cylinder in the circumferential direction is heated with hot gas and the other part of the wall is otherwise cooled with atmosphere air such that the engine could deliver work as heat transfer occurs during rotation. A thermodynamic model of this engine was developed in this paper, and the effect of some parameters, including rotation speed, mass of air inside chamber, compression ratio and different heating temperatures, on the output power as well as thermal efficiency was investigated. It was found that the highest efficiency can reach 10.8% and the maximum output power can reach 0.3684W. The compression ratio of 4 was found to have the highest efficiency, and the compression ratio of 6 was found to have the maximum power output. Besides, it was found that as heating temperature increases the efficiency and power increase too

scholarly journals Thermoelectric Exhaust Energy Recovery with Temperature Control through Heat Pipes

2011 ◽  
Author(s):  
Jorge Martins ◽  
L.M. Goncalves ◽  
Joaquim Antunes ◽  
Francisco P. Brito
Keyword(s):  
Temperature Control ◽  
Energy Recovery ◽  
Heat Pipes ◽  
Exhaust Energy

Promises and Challenges of the Low-Heat-Rejection Diesel

1988 ◽  
Vol 110 (3) ◽  
pp. 475-481 ◽  
Author(s):  
C. A. Amann
Keyword(s):  
Heat Loss ◽  
Convective Heat ◽  
Cooling System ◽  
Particulate Emissions ◽  
Full Potential ◽  
Engine Fuel ◽  
Heat Rejection ◽  
Convective Heat Loss ◽  
Exhaust Energy ◽  
Liquid Cooling System

The low-heat-rejection (LHR) diesel promises decreased engine fuel consumption by eliminating the traditional liquid cooling system and converting energy normally lost to the coolant into useful shaft work instead. However, most of the cooling energy thus conserved is transferred into the exhaust stream rather than augmenting crankshaft output directly, so exhaust-energy recovery is necessary to realize the full potential of the LHR engine. The higher combustion temperature of the LHR diesel favors increased emission of NOx, with published results on hydrocarbon and particulate emissions showing mixed results. The cylinder insulation used to effect low heat rejection influences convective heat loss only, and in a manner still somewhat controversial. The cyclic aspect of convective heat loss, and radiation from incandescent soot particles, also deserve attention. The temperatures resulting from insulating the cylinder of the LHR diesel require advancements in lubrication. The engine designer must learn to deal with the probabilistic nature of failure in brittle ceramics needed for engine construction. Whether ceramic monoliths or coatings are more appropriate for cylinder insulation remains unsettled. These challenges confronting the LHR diesel are reviewed.

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