Feasibility study on recovering exhaust energy from a vehicle engine system by a scroll expander

2012 ◽  
Author(s):  
Xing Luo ◽  
Jihong Wang ◽  
Hao Sun ◽  
Hongming Xu
Keyword(s):  
Feasibility Study ◽  
Vehicle Engine ◽  
Scroll Expander ◽  
Engine System ◽  
Exhaust Energy

scholarly journals Feasibility Study of a Scroll Expander for Recycling Low-Pressure Exhaust Gas Energy from a Vehicle Gasoline Engine System

Energies ◽  
2016 ◽  
Vol 9 (4) ◽  
pp. 231 ◽  
Author(s):  
Xing Luo ◽  
Jihong Wang ◽  
Christopher Krupke ◽  
Hongming Xu
Keyword(s):  
Feasibility Study ◽  
Gasoline Engine ◽  
Low Pressure ◽  
Exhaust Gas ◽  
Scroll Expander ◽  
Engine System

Feasibility Study of an Oil-Free Turbocharger Supported on Gas Foil Bearings via On-Road Tests of a 2-Liter Class Diesel Vehicle

2012 ◽  
Author(s):  
Kyuho Sim ◽  
Suk Bum Kwon ◽  
Tae Ho Kim ◽  
Yong-Bok Lee
Keyword(s):  
Feasibility Study ◽  
Vehicle Suspension ◽  
External Shocks ◽  
Variable Geometry Turbocharger ◽  
Foil Bearings ◽  
Synchronous Motion ◽  
Vehicle Engine ◽  
Compressor Impeller ◽  
Non Destructive ◽  
Diesel Vehicle

This paper presents the feasibility study of an oil-free turbocharger (TC) supported on gas foil bearings (GFBs) via on-road tests of a 2-liter class diesel vehicle. The oil-free TC is constructed using a hollow rotor with a radial turbine at one end and a compressor impeller at the other end, a center housing with journal and thrust GFBs, and turbine and compressor casings. The oil-free TC reuses parts of a commercial variable geometry turbocharger except for the rotor-bearing system. In a test rig driven by a diesel vehicle engine (EG), the rotordynamic performance of the oil-free TC is evaluated up to the rotor speed of 130 krpm, while being measured at the compressor end. The journal GFBs are modified to enhance the rotordynamic performance by inserting three metal shims between the bump-strip layers and bearing housing. The rotordynamic performance is also measured during on-road tests by replacing the original TC of the test diesel vehicle with the constructed oil-free TC. The journal GFBs have a relatively large bearing clearance and no metal shims to generate sub-synchronous motions at low TC and EG speeds. During normal vehicle driving, the TC rotor motions show steady rotordynamic operations. The oil-free TC rotates at 25 krpm ∼50 krpm while the vehicle runs at 20 km/h ∼30 km/h on the roads. Sub-synchronous rotor motions initiate with a frequency of ∼100 Hz at the TC speed of ∼37 krpm. The TC rotor motion also shows multiple EG-induced harmonics, as expected. Upon external shocks given by passing the vehicle on road-bumps, the sub-synchronous motions are excited only when the rotor rotates above the initiation speed of sub-synchronous motion. The excitation is non-destructive because the vehicle suspension absorbs most of the external shock. Incidentally, the external shocks appear to have no influence on the synchronous motion and engine-induced harmonics of the TC rotor.

Experimental Study on Output Characteristics of Scroll Expander Used as Air Powered Vehicle Engine

2012 ◽  
Vol 516-517 ◽  
pp. 614-618
Author(s):  
Chao Shan Zhang ◽  
Shu Sheng Xiong ◽  
Xiao Shuai Ren ◽  
Wei Li
Keyword(s):  
Experimental Study ◽  
Consumption Rate ◽  
Test System ◽  
Maximum Efficiency ◽  
Air Mass ◽  
Mass Consumption ◽  
Rotating Speed ◽  
Vehicle Engine ◽  
Scroll Expander ◽  
Assembly Accuracy

An experimental study was carried out on a prototype of a scroll expander used as the air-powered vehicle engine. The speed characteristic was tested based on the test system at the constant suction temperature and pressure. The results show that the air mass consumption rate and the output power both increase with the rotating speed. The maximum air mass consumption rate is 800kg/h and the maximum power achieves 8.112 kW. The effective efficiency increases with the rotating speed but the increment decreases. The maximum efficiency is only 0.26 due to the low manufacturing and assembly accuracy of the expander.

A feasibility study of a new ATREX engine system of aft-turbine configuration

2002 ◽  
Vol 51 (1-9) ◽  
pp. 153-160 ◽  
Author(s):  
Kousuke Isomura ◽  
Junsuke Omi ◽  
Nobuhiro Tanatsugu ◽  
Tetsuya Sato ◽  
Hiroaki Kobayashi
Keyword(s):  
Feasibility Study ◽  
Engine System

Feasibility Study of an Oil-Free Turbocharger Supported on Gas Foil Bearings Via On-Road Tests of a Two-Liter Class Diesel Vehicle

2013 ◽  
Vol 135 (5) ◽  
Author(s):  
Yong-Bok Lee ◽  
Suk Bum Kwon ◽  
Tae Ho Kim ◽  
Kyuho Sim
Keyword(s):  
Feasibility Study ◽  
External Shocks ◽  
Variable Geometry Turbocharger ◽  
The Road ◽  
Foil Bearings ◽  
Synchronous Motion ◽  
Vehicle Engine ◽  
Compressor Impeller ◽  
On The Road ◽  
Diesel Vehicle

This paper presents the feasibility study of an oil-free turbocharger (TC) supported on gas foil bearings (GFBs) via on-road tests of a 2-liter class diesel vehicle. The oil-free TC is constructed using a hollow rotor with a radial turbine at one end and a compressor impeller at the other end, a center housing with journal and thrust GFBs, and turbine and compressor casings. The oil-free TC reuses parts of a commercial variable geometry turbocharger, except for the rotor-bearing system. In a test rig driven by a diesel vehicle engine (EG), the rotordynamic performance of the oil-free TC is evaluated up to the rotor speed of 130 krpm, which is measured at the compressor end. The journal GFBs are modified to enhance the rotordynamic performance by inserting three metal shims between the bump-strip layers and bearing housing. The rotordynamic performance is also measured during on-road tests by replacing the original TC of the test diesel vehicle with the constructed oil-free TC. The journal GFBs have a relatively large bearing clearance and no metal shims to generate subsynchronous motions at low TC and EG speeds. During normal vehicle driving, the TC rotor motions show steady rotordynamic operations. The oil-free TC rotates at 25 krpm ∼ 50 krpm while the vehicle runs at 20 km/h ∼ 30 km/h on the road. Subsynchronous rotor motions initiate with a frequency of ∼100 Hz at the TC speed of ∼37 krpm. As expected, the TC rotor motion also shows multiple EG-induced harmonics. Upon external shocks, produced by driving the vehicle on road-bumps, the subsynchronous motions are only excited when the rotor rotates above the initiation speed of subsynchronous motion. The excitation is nondestructive because the vehicle suspension absorbs most of the external shock. Incidentally, the external shocks appear to have no influence on the synchronous motion and engine-induced harmonics of the TC rotor.

scholarly journals Location of unbalance mass and supporting bearing for different type of balance shaft module

2018 ◽  
Vol 9 (2) ◽  
pp. 259-266
Author(s):  
Chan-Jung Kim
Keyword(s):  
Dynamic Characteristics ◽  
Dynamic Performance ◽  
Reaction Force ◽  
Optimal Location ◽  
Concept Design ◽  
Vehicle Engine ◽  
Balance Shaft ◽  
Engine System ◽  
Rotor Structure

Abstract. The dynamic characteristics of balance shaft module is controlled by the design of rotating parts as how to allocate both a unbalance mass and a supporting bearing so that the concept design of a rotor structure is the key issue on determining the overall quality of dynamic performance as well as fatigue resistance. Even the design on balance shaft has some limitation from the lay-out of a vehicle engine system, there is still chance to enhance the reliability of the balance shaft module by the promising design model of the rotor structure including support bearing locations. In this paper, an optimal location of unbalance mass and supporting bearing is proposed to make an efficient conceptual design using an objective function to minimize a bending deformation of rotor as well as a reaction force at supporting bearing. In addition, the application of design optimization of a balance shaft model is explained using an in-house program for inline 3-cylinder and inline 4-cylinder engine, respectively.

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