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Research Papers: Gas Turbines: Controls, Diagnostics, and Instrumentation

Development of Double Gear Fuel Pump for Heat Management Improvement

[+] Author and Article Information
Yasushi Matsunaga

 Ishikawajima-Harima Heavy Industries Co. Ltd., Mizuho-machi, Nishitama-gun, Tokyo 190-1297, Japanyasushi̱matsunaga@ihi.co.jp

Noriko Morioka

 Ishikawajima-Harima Heavy Industries Co. Ltd., Mizuho-machi, Nishitama-gun, Tokyo 190-1297, Japannoriko̱morioka@ihi.co.jp

Seiei Masuda

 Ishikawajima-Harima Heavy Industries Co. Ltd., Mizuho-machi, Nishitama-gun, Tokyo 190-1297, Japanseiei̱masuda@ihi.co.jp

Masahiro Kurosaki

 Ishikawa National College of Technology, Kitacyujo, Tsubata, Kahoku-gun, Ishikawa 929-0392, Japankurosaki@ishikawa-nct.ac.jp

J. Eng. Gas Turbines Power 132(8), 081601 (May 18, 2010) (9 pages) doi:10.1115/1.2833492 History: Received July 05, 2006; Revised September 25, 2007; Published May 18, 2010; Online May 18, 2010

A unique double gear fuel pump system with operation mode switching capability for aircraft engines was developed to solve the heat management problem of current high efficiency turbofan engines and improve specific fuel consumption (SFC). Mode switching from parallel operations to series operations was found to reduce the discharge flow and pump work to nearly half. This resulted in the reduction of the rise in fuel temperature due to the fuel recirculation at the high altitude low Mach number flight condition. Air cooled oil cooler (ACOC) is usually required for sufficient oil cooling at descent or approach flight conditions. Since fuel consumption at those conditions is not very high, most of the gear pump discharge fuel flow proportional to the engine speed is returned to the fuel pump inlet resulting in significant heating. The ACOC that provides additional cooling capability degrades SFC due not only to the increased weight but also to the wasted fan discharge air. By reducing fuel temperature rise at the pump at those flight conditions, the necessity of ACOC may be eliminated. Further, it is shown that a reduction by half of the double gear pump weight can be achieved by increasing pump speed twice without incurring a durability penalty. Extensive tests showed sufficient steady state pump performance, switching characteristics, and durability.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Typical fuel and lubrication oil system for turbofan engines

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Figure 2

Hydraulic circuit and operation modes

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Figure 3

Pressure distribution on floating bearings top: (a) parallel operation; (b) series operation

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Figure 4

Radial force direction: (a) parallel operation; (b) series operation

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Figure 5

Flow inside tip clearance

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Figure 6

Pump weight versus pump speed

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Figure 7

Cross-section diagram of Type H

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Figure 8

3D external and cutaway view of Type H

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Figure 9

Main components of Type C (top) and Type H (bottom)

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Figure 10

Bench test setup

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Figure 11

Block diagram of bench test setup

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Figure 12

P-Q characteristics: (a) Type H; (b) Type C

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Figure 13

Double gear pump volumetric efficiency: (a) Type H; (b) Type C

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Figure 14

Typical fuel metering system

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Figure 15

Mode transition behavior

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Figure 16

Mode switching test result

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Figure 17

Switching durability

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Figure 18

Pump work reduction of Type H

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Figure 19

Fuel temperature rise

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