| Project/Area Number |
62550123
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Fluid engineering
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| Research Institution | University of Tokyo |
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Principal Investigator |
YOSHIKI Haruo Institute of Industrial Science, Univ. of Tokyo ・ Associate Professor, 生産技術研究所, 助教授 (60013207)
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| Co-Investigator(Kenkyū-buntansha) |
ENDOH Toshihiko Institute of Industrial Science, Univ. of Tokyo ・ Research Assistant, 生産技術研究所, 助手 (40013164)
TASHIRO Shin-ichi Tokyo Metropolitan Institute of Technology ・ Associate Professor, 助教授 (30149356)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1987: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Turbocharging / Pulse Charging / Radial Exhaust Turbine / Exhaust Manifold / Pulsating Flow / 特性曲線法 |
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| Research Abstract |
Using a twin-entry thrbocharger, which is the most popular type for automotive uses, experiments were conducted under both steady and pulsating flow conditions. The steady flow test was planned to get a flow rate characteristic of the turbine for fully and partially admitted cases by means that the turbine power was absorbed by a co-axial blower. The pulsating test was carried by using a motored in-line-six diesel engine as a pulse generator. We measured the flow rate by a flow meter, pressures at some positions of intake and exhaust passages including a cylinder and turbine by manometers and pressure transducers, and the engine and turbine speeds. Furthermore, we analized numerically a one-dimensional flow model including engine cylinders and a radial exhaust turbine by the method of characteristics and MacCormack scheme. As a result, the following facts are made clear.
1. The turbine characteristic for steady flow partially admitted from the turbine scroll 1 or 2 is about a half of the flow rate for fully admitted from the scroll 1 and 2.
2. Being able to neglect a resonance in the exhaust manifold, the turbine flow rate is mainly dominated by the flow characteristic of engine and is linear to the engine speed.
3. The pressure varies uniformly in the short exhaust manifold.
4. Considering a turbocharged diesel engine including cylinders and a radial exhaust turbine as a one-dimensional flow model and abopting an equal pressure model at pipe junctions, the numerical analysis gives fairly well results of the flow rate and the pressure waves taking account of re-verse flow losses at the junctions.
5. Results of MacCormack scheme are the same as those gotten by the method of characteristics and the time required to calculate by the former method is about one third of that by the latter.
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