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TECHNICAL PAPERS

Gas Pulsation Reductions in a Multicylinder Compressor Suction Manifold Using Valve-to-Valve Mass Flow Rate Phase Shifts

[+] Author and Article Information
Jeong-Il Park

School of Mechanical Engineering, Ray W. Herrick Laboratories, Purdue University, 140 S. Intramural Drive, West Lafayette, IN 47907-2031skan99@hotmail.com

Nasir Bilal1

School of Mechanical Engineering, Ray W. Herrick Laboratories, Purdue University, 140 S. Intramural Drive, West Lafayette, IN 47907-2031bilal@ecn.purdue.edu

Douglas E. Adams

School of Mechanical Engineering, Ray W. Herrick Laboratories, Purdue University, 140 S. Intramural Drive, West Lafayette, IN 47907-2031deadams@purdue.edu

1

Corresponding author.

J. Vib. Acoust 129(4), 406-416 (Feb 06, 2007) (11 pages) doi:10.1115/1.2748457 History: Received February 15, 2005; Revised February 06, 2007

This paper investigates the pressure pulsations caused by each mass flow rate through the suction valves and ports of a multicylinder compressor in order to attribute high-pressure pulsation responses to certain valves. By staggering the valve configurations appropriately, it is shown that the level of gas pulsations in the suction manifold of a multicylinder automotive compressor can be reduced. First, the equation for a compression cycle, a Bernoulli-Euler linear differential beam equation for the suction valves, and the piston kinematics are considered in order to calculate the mass flow rates through the compressor suction valves. The pressure pulsations in the suction manifold are then predicted based on the characteristic cylinder method using the calculated mass flow rates. In order to investigate the effects of each mass flow rate, the characteristics and phases of the mass flow rates through the suction valves are changed by modifying the clearance volume.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Simulation flowchart for the compressor model

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Figure 2

Configuration of a seven-cylinder compressor

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Figure 3

Schematic of the valve with piecewise linear springs

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Figure 4

Suction valve/port locations

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Figure 5

Schematic of (a) a real annular cavity and (b) assumed simplified suction manifold

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Figure 6

Geometry of the suction line in the test bench

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Figure 7

Schematic of experimental test apparatus

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Figure 8

Pressure responses in the cylinder at 1500rpm with (a) 50kg∕h and (b) 70kg∕h, and 2000rpm with (c) 70kg∕h and (d) 90kg∕h (--- analysis, —experiment)

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Figure 9

Gas pulsations along the circumferential direction near the first set of natural frequencies at 1500rpm with (a) 50kg∕h and (b) 70kg∕h (-엯- 500Hz, -×- 550Hz; analysis, —500Hz, --- 550Hz; experiment), and 2000rpm with (c) 70kg∕h and (d) 90kg∕h (-엯- 433Hz, -×- 500Hz; analysis, —433Hz, --- 500Hz, experiment)

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Figure 10

Gas pulsations in the time domain at 1500rpm with (a) 50kg∕h and (b) 70kg∕h, and 2000rpm with (c) 70kg∕h and (d) 90kg∕h (--- analysis, —experiment)

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Figure 11

Real and imaginary parts of gas pulsations at 500Hz at 1500rpm with (a) 50kg∕h and (b) 70kg∕h, and at 2000rpm with (c) 70kg∕h and (d) 90kg∕h

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Figure 12

Real part of pressure pulsations at 1500rpm with (a) 50kg∕h and (c) 70kg∕h, and imaginary part of pressure pulsations at 1500rpm with (b) 50kg∕h and (d) 70kg∕h along the circumferential direction of the suction manifold at 500Hz

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Figure 13

Real part of pressure pulsations at 2000rpm with (a) 70kg∕h and (c) 90kg∕h, and imaginary part of pressure pulsations at 2000rpm with (b) 70kg∕h and (d) 90kg∕h along the circumferential direction of the suction manifold at 500Hz

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Figure 14

Pressure pulsations caused by mass flow rate at valve location 2 at 1500rpm with 50kg∕h capacity ((a) amplitude and (b) phase) and at 2000rpm with 70kg∕h capacity ((c) amplitude and (d) phase) along the circumferential direction

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Figure 15

Gas pulsations near the first set of natural frequencies in the suction manifold when mass flow rate at valve location 2 is perturbed by adding the 225mm3 clearance volume at (a) 1500rpm with 50kg∕h and (b) 2000rpm with 70kg∕h capacity

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Figure 16

Gas pulsations in the frequency domain at valve location 2 when mass flow rate at valve location 2 is perturbed by adding the 225mm3 clearance volume at (a) 1500rpm with 50kg∕h and (b) 2000rpm with 70kg∕h capacity

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