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Research Papers: Flows in Complex Systems

Experimental Analysis, Modeling, and Control of Volumetric Radial-Piston Pumps

[+] Author and Article Information
Andrea E. Catania, Alessandro Ferrari

Department of Energetics, Politecnico di Torino, Italy

J. Fluids Eng 133(8), 081103 (Aug 19, 2011) (12 pages) doi:10.1115/1.4004443 History: Published August 19, 2011; Online August 19, 2011

An experimental-theoretical study has been carried out on high-pressure volumetric radial-piston pumps for diesel fuel injection systems. The dependence of the pump inducted flow rate on speed and load was investigated and the characteristic curve of the pump cooling-lubrication circuit was derived. The head-capacity curves were determined for different types of pumps at different revolution speeds and compared with the injector flow requirements in order to evaluate the pressure-control strategy efficiency. An insight into the ageing effects on the pump performance was also provided. Furthermore, the dynamic pump behavior was investigated, with specific reference to the flow-rate ripple at the delivery port. A general analytical expression has been derived for the volumetric efficiency. Furthermore, a specific procedure has been developed and applied to the experimental evaluation of the fuel leakages in pressure control valve (PCV) integrated pumps. Finally, the mechanical-hydraulic efficiency of the pump has experimentally been assessed as a function of head and speed in order to obtain a reliable evaluation of the pump shaft power and torque at different working conditions.

Copyright © 2011 by by ASME
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References

Figures

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Figure 1

High-pressure radial-piston pump stator and cooling-lubrication circuit

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Figure 2

Longitudinal section of the radial-piston pump with PCV

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Figure 3

Pressure control valve

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Figure 4

Pump with fuel metering valve

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Figure 5

Flow rate at pump inlet versus n for prail  = 750 bar (pump 1)

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Figure 6

Flow rate at pump inlet versus n for prail  = 1400 bar (pump 1)

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Figure 7

Cooling and lubrication flow rate versus plp (pump 1)

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Figure 8

λv as a function of prail for pump 1

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Figure 9

ηv dependence on n at distinct values of prail (pump 1)

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Figure 10

ηv dependence on prail at distinct values of n (pump 1)

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Figure 11

ηv as a function of n for different values of prail (pump 2)

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Figure 12

λv as a function of prail for different values of n (pump 2)

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Figure 13

ηmh dependence on prail at distinct values of n (pump 1)

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Figure 14

ηmh dependence on n at distinct prail pressures (pump 1)

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Figure 15

Steady friction coefficient pattern with respect to n

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Figure 16

Quantity balance (pump 1)

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Figure 17

Effect of ageing on the performance of pump 2

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Figure 18

Kinematic scheme of pump 2

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Figure 19

Validation of the piston kinematic model (pump 2)

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Figure 20

Instantaneous delivered flow rate: n = 1000 rpm, ΔθBC  = 0 (pump 2)

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Figure 21

Ripple dependence on the pump geometry (pump 2)

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Figure 22

Working cycle of the pump piston

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Figure 23

Effect of ΔθBC (prail  = 1600 bar, n = 1000 rpm)

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