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Item Information   Holdings       More by this author     Lentz, Christopher     Subjects     Fluid dynamics -- Mathematical models     Heat -- Transmission     Turbulence     Internal combustion -- Valves     MSE Project.     Browse Catalog     by author:      Lentz, Christopher       by title:      Investigating and mi...         MARC Display

Investigating and minimizing the effects of oil viscosity on the metering characteristics of the pilot-stage of an electro hydraulic poppet valve / by Christopher Lentz. by Lentz, Christopher Subjects Fluid dynamics -- Mathematical models   Heat -- Transmission   Turbulence   Internal combustion -- Valves   MSE Project. Description:  113 leaves : ill. ; 29 cm. Contents:  Thesis advisor: Dr. William Carnell Committee members: Dr. Subha Kumpaty, Thomas Wanke Introduction, background, and problem definition -- Technical approach -- Existing EHPV geometry results and analysis -- Geometry modifications -- Conclusions and recommendations. The Electro-Hydraulic Poppet Valve (EHPV) is a key technology in HUSCO International's product line, enabling a state of the art hydraulic control valve to be realized. The EHPV has not yet been optimized to work with high viscosity oil typically found in cold weather environments. Experiments conducted by HUSCO have indicated the maximum capacity of the valve is reduced by approximately 40% at an oil temperature of 320F. The pilot-state of the EHPV valve consists of a fixed orifice and a pilot restriction, and is one of the possible components of the valve that could be responsible for this degredation in performance. The purpose of this project was to use Computational Fluid Dynamics (CFD) software to quantify the viscosity sensitivity of the EHPV valve's pilot-stage and determine through geometry modification how performance over the operating temperature range can be improved. The CFD results of the pilot-stage's fixed orifice compared well with experimental data found in previous studies. The results of the CFD analysis of both the fixed orifice and pilot restriction did not compare as closely to data from an experiment conducted using the EHPV valve, but the same qualitative trends were visible in the CFD as compared to the experimental data. The CFD and experimental data showed that the performance of the fixed orifice and pilot restriction diverged as the oil temperature decreased with the CFD indicating a larger discrepancy between the two. Further CFD analysis showed that modifications to the pilot restriction geometry had little influence on the valve's performance, but if the length of the fixed orifice was increased by a factor of ten the performance of the fixed orifice and pilot restriction would match 1100F and 320F, improving the performance of the EHPV over the temperature range analyzed.   Copy/Holding information Location Collection Call No. Status   Walter Schroeder Library Master's Theses AC805 .L46 2010 Available Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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