Browsing Mechanical Engineering by Author "Depcik, Christopher David"

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Comparison of lithium ion batteries, hydrogen fueled combustion Engines, and a hydrogen fuel cell in powering a small unmanned aerial vehicle

Depcik, Christopher David; Cassady, Truman; Collicott, Bradley; Burugupally, Sindhu Preetham; Li, Xianglin; Alam, Shah Saud; Arandia, Jose Rocha; Hobeck, J. D. (Elsevier, 2020-03-01)

The relatively low energy density of lithium ion (Li-ion) batteries that power small Unmanned Aerial Vehicles (UAVs) limits their operating range. The use of hydrogen can provide a significant range improvement given its ...
The effect of working fluid properties on the performance of a miniature free piston expander for waste heat harvesting

Burugupally, Sindhu Preetham; Weiss, Leland; Depcik, Christopher David (Elsevier, 2019-03-25)

Power generation from waste heat sources at the miniature length scales may be generated by using phase change working fluids (liquid-to-vapor) in a traditional boiler-expander-condenser-pump system. This paper builds on ...
Modification of the Wiebe function for methane-air and oxy-methane- based spark-ignition engines

Alam, Shah Saud; Rosa, Scott W.; Depcik, Christopher David; Preetham Burugupally, Sindhu; McDaniel, Ethan; Hobeck, J. D. (Elsevier, 2021-11-01)

Predictive combustion models assess engine performance for given setpoints by determining the rate of heat release that is governed by the fuel mass burned. Often, simple mathematical functions such as the Wiebe function ...