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Research Papers: Gas Turbines: Turbomachinery

A Matching Method for Two-Stage Turbocharging System

[+] Author and Article Information
Liu Yanbin

State Key Laboratory of Automotive Safety
and Energy,
Tsinghua University,
Beijing 100084, China
Department of Mechanical Engineering,
Academy of Armored Force Engineering,
Beijing 100072, China
e-mail: liu-yb10@mails.tsinghua.edu.cn

Zhuge Weilin

State Key Laboratory of Automotive
Safety and Energy,
Tsinghua University,
Beijing 100084, China
e-mail: zhugewl@tsinghua.edu.cn

Zhang Yangjun

State Key Laboratory of Automotive
Safety and Energy,
Tsinghua University,
Beijing 100084, China
e-mail: yjzhang@tsinghua.edu.cn

Zhang Shuyong

National Key Laboratory of Diesel Engine
Turbocharging Technology,
Tianjin 037036, China
e-mail: 13935298796@163.com

Zhang Junyue

National Key Laboratory of Diesel Engine
Turbocharging Technology,
Tianjin 037036, China
e-mail: dt70zjy@163.com

Huo Xuemin

National Key Laboratory of Diesel Engine
Turbocharging Technology,
Tianjin 037036, China
e-mail: huoxuemin@163.com

1Corresponding author.

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 19, 2014; final manuscript received July 23, 2014; published online September 16, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(2), 022604 (Sep 16, 2014) (8 pages) Paper No: GTP-14-1413; doi: 10.1115/1.4028387 History: Received July 19, 2014; Revised July 23, 2014

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.

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References

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Figures

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Fig. 1

Structure of two-stage turbocharging system

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Fig. 2

A turbine characteristic of Garrett: (a) high pressure reference turbine and (b) low pressure reference turbine

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Fig. 3

Influence of compressor ratio on compress process when total compressor ratio is 4.5

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Fig. 4

Influence of compressor ratio on compress process when total compressor ratio is 5

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Fig. 5

Influence cooler efficiency on compressor work

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Fig. 6

Influence cooler pressure loss on compressor work

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Fig. 7

Influence flow capacity and by-pass valve on turbine output work

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Fig. 8

Matching points of turbine system and compressor system

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Fig. 9

Work of compressor system changes with intercooler efficiency and pressure drop

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Fig. 10

Matching in purpose of the highest system efficiency

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Fig. 11

Matching in larger flow operation point

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Fig. 12

Process of two-stage turbocharging system matching

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Fig. 13

System efficiency of different matching cases

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Fig. 14

Flow capacity of turbine: (a) low pressure turbine and (b) high pressure turbine

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Fig. 15

MAP of compressor and matching points: (a) low pressure compressor and (b) high pressure compressor

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Fig. 16

MAP of compressor and matching points: (a) low pressure compressor and (b) high pressure compressor

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