Effect of inlet valve timing on boosted gasoline HCCI with residual gas trapping

This article analyzes the effect of electrostatically actuated flexible microvalves on the output performance of electrostatic micropumps. The existence of microvalves affects the pressure rise and volumetric efficiency of micropumps. The effects of valve volume on the pressure rises of pumps with single and double cavities are predicted by integrating energy minimization with the analytical solutions for circular membrane deflection under uniform pressure. Outlet valve resistance is analytically specified as well. The micropumps could achieve their maximum volumetric efficiency in the case of zero back pressure. However, the design of the inlet valve leads to gas trapping in the inlet valve during discharge. In such a situation, the volumetric efficiency of the pumps drops along with the increase of pressure rise. Moreover, the flexibility of valve plates yields a much lower voltage than the cavity actuation for the valve closing and the breakdown voltage of the dielectric layer on the valve body, thereby enhancing the reliability of the microvalves.

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Effect of water blending on bioethanol HCCI combustion with forced induction and residual gas trapping

Energy ◽

10.1016/j.energy.2007.05.010 ◽

2007 ◽

Vol 32 (12) ◽

pp. 2396-2400 ◽

Cited By ~ 41

Author(s):

A. Megaritis ◽

D. Yap ◽

M.L. Wyszynski

Keyword(s):

Effect Of Water ◽

Hcci Combustion ◽

Gas Trapping ◽

Residual Gas

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The effects of residual gas trapping on part load performance and emissions of a spark ignition direct injection engine fuelled with wet ethanol

Applied Energy ◽

10.1016/j.apenergy.2019.113508 ◽

2019 ◽

Vol 253 ◽

pp. 113508 ◽

Cited By ~ 8

Author(s):

Thompson Diórdinis Metzka Lanzanova ◽

Macklini Dalla Nora ◽

Mario Eduardo Santos Martins ◽

Paulo Romeu Moreira Machado ◽

Vinícius Bernardes Pedrozo ◽

...

Keyword(s):

Direct Injection ◽

Spark Ignition ◽

Direct Injection Engine ◽

Part Load ◽

Gas Trapping ◽

Performance And Emissions ◽

Residual Gas

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Applying Forced Induction to Bioethanol HCCI Operation with Residual Gas Trapping

Energy & Fuels ◽

10.1021/ef0498162 ◽

2005 ◽

Vol 19 (5) ◽

pp. 1812-1821 ◽

Cited By ~ 10

Author(s):

D. Yap ◽

A. Megaritis

Keyword(s):

Gas Trapping ◽

Residual Gas

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The Pumping Dynamics of a Positive Displacement Pump Employing Self-Acting Valves

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.2896204 ◽

1990 ◽

Vol 112 (4) ◽

pp. 748-754 ◽

Cited By ~ 1

Author(s):

K. A. Edge ◽

P. N. Brett

Keyword(s):

Pressure Fluctuations ◽

Experimental Tests ◽

General Purpose ◽

Operating Conditions ◽

Cylinder Pressure ◽

Valve Timing ◽

Inlet Valve ◽

Positive Displacement ◽

Displacement Pump ◽

Valve Dynamics

The paper describes a general purpose digital computer model for the analysis of the pumping dynamics of positive displacement pumps employing self-acting valves. This model is verified by comparison with experimental tests on a diaphragm separator pump. Predicted and simulated cylinder pressure transients and inlet and delivery valve dynamics are compared over the complete pumping cycle. Close agreement between theory and experiment is achieved. The induction performance of the pump is examined in detail and the effects of operating conditions on volumetric efficiency are presented. The effect of inlet valve timing on delivery manifold pressure fluctuations is also discussed.

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