Optimization of an Electric Turbo Compounding System for Gasoline Engine Exhaust Energy Recovery

2011 ◽  
Author(s):  
Weilin Zhuge ◽  
Lei Huang ◽  
Wei Wei ◽  
Yangjun Zhang ◽  
Yongsheng He
Keyword(s):  
Energy Recovery ◽  
Gasoline Engine ◽  
Engine Exhaust ◽  
Exhaust Energy

Energy Availability Study for a Regenerative Hydraulically Assisted Turbocharger

2018 ◽  
Author(s):  
Tao Zeng ◽  
Yifan Men ◽  
Devesh Upadhyay ◽  
Guoming Zhu
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Energy Recovery ◽  
Performance Enhancement ◽  
Engine Performance ◽  
Energy Availability ◽  
Engine Exhaust ◽  
Performance And Emissions ◽  
Exhaust Energy ◽  
Engine Performance And Emissions

Engine downsizing and down-speeding are essential to meet future US fuel economy mandates. While turbocharging has been a critical enabler for downsizing, transient boost response performance remains a concern even with variable geometry turbochargers. This slow build-up of boost and hence torque is commonly referred to as turbo-lag. Mitigation of turbo-lag has, therefore, remained an important objective of turbocharger performance enhancement research. A regenerative, hydraulically assisted turbocharger is one such enhanced turbocharging system that is able regulate the turbocharger speed independent of the available engine exhaust energy. With external power available on the turbocharger shaft, the engine performance and emissions can be managed during both transient and steady-state operations. The key to fully utilizing the ability of such an assisted turbocharger depends on the energy recovered from turbocharger shaft and/or vehicle driveline. Energy available from the turbocharger shaft is dependent on the engine exhaust gas energy. Energy recovered from the driveline depends on vehicle braking energy. A previously developed high-fidelity 1-D simulation of a diesel engine with a regenerative-hydraulically assisted turbocharger is used to investigate the energy availability for a medium duty diesel engine over standard driving cycles. The study shows that the energy recovery from turbocharger shaft is limited and driveline energy recovery is necessary for achieving fuel economy benefits on the order of 4%.

Nozzle Steam Piston Expander for Engine Exhaust Energy Recovery

2015 ◽  
Author(s):  
Meng Choung Chiong ◽  
Srithar Rajoo ◽  
Alessandro Romagnoli
Keyword(s):  
Energy Recovery ◽  
Engine Exhaust ◽  
Exhaust Energy

scholarly journals Condensational uptake of semivolatile organic compounds in gasoline engine exhaust onto pre-existing inorganic particles

2011 ◽  
Vol 11 (1) ◽  
pp. 3461-3492
Author(s):  
S.-M. Li ◽  
J. Liggio ◽  
L. Graham ◽  
G. Lu ◽  
J. Brook ◽  
...  
Keyword(s):  
Air Quality ◽  
Gas Phase ◽  
Organic Compounds ◽  
Gasoline Engine ◽  
Particle Mass ◽  
Seed Particle ◽  
Dilution Ratio ◽  
Ambient Conditions ◽  
Engine Exhaust ◽  
Inorganic Particles

Abstract. This paper presents the results of laboratory studies on the condensational uptake of gaseous organic compounds in the exhaust of a light-duty gasoline engine onto preexisting sulfate and nitrate seed particles. Significant condensation of the gaseous organic compounds in the exhaust occurs onto pre-existing inorganic particles on a time scale of 2–5 min. The amount of condensed organic mass (COM) is proportional to the seed particle mass, suggesting that the uptake is due to dissolution, not adsorption. The solubility decreases as a power function with increased dilution of the exhaust, ranging from 0.23 g/g at a dilution ratio of 81, to 0.025 g/g at a dilution ratio of 2230. The solubility increases nonlinearly with increasing concentration of the total hydrocarbons in the gas phase (THC), rising from 0.12 g/g to 0.26 g/g for a CTHC increase of 1 to 18 μg m−3, suggesting that more organics are partitioned into the particles at higher gas phase concentrations. In terms of gas-particle partitioning, the condensational uptake of THC gases in gasoline engine exhaust can account for up to 30% of the total gas+particle THC. By incorporating the present findings, regional air quality modelling results suggest that the condensational uptake of THC onto sulfate particles alone can be comparable to the primary particle mass under moderately polluted ambient conditions. These findings are important for modelling and regulating the air quality impacts of gasoline vehicular emissions.

Corrosion Performance of Austenitic Alloys in Automobile Exhaust Environments

1977 ◽  
Vol 99 (3) ◽  
pp. 234-238 ◽  
Author(s):  
J. E. Chart ◽  
H. T. Michels
Keyword(s):  
Water Vapor ◽  
Stainless Steels ◽  
Gasoline Engine ◽  
General Trend ◽  
Nickel Content ◽  
Superior Performance ◽  
Corrosion Performance ◽  
Engine Exhaust ◽  
Austenitic Alloys ◽  
Nickel Base

The performance of several austenitic alloys ranging from low alloy content stainless steels to nickel-base alloys has been evaluated at temperatures from 704–1093°C (1300–2000°F) in cyclic air + 10 percent water vapor and from 704–982°C (1300–1800°F) in gasoline engine exhaust. The gasoline engine exhaust was found to be the more aggresive of the two test environments. A general trend of increasing performance with increasing nickel content was observed. At the highest test temperatures in both tests, the nickel-base alloys clearly displayed superior performance.

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.

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