Impact of the Geometrical Parameters of Valve less Pulse jet Engine on the Thrust

Document Type : Research Paper

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Abstract

Simple designing, low maintenance and build cost, and high ratio of thrust to weight, also new methods of numerical simulating and solution causes to develop the Pulse Jet engine usage in non-military fields. Impact of geometrical parameters of valve less pulse jet engine on thrust has been studied in this article. First, study concentrate on main geometrical parameters like diameter and length, and transform those parameters to dimension less parameters (length to mean diameter ratio) for each section of the engine. Then the allowable range for parameters is achieved based upon experimental researches of Lockwood. Ten new geometries for valve less pulse jet engine has been defined and numerical solution of two-dimension flow field of inside engine has been presented with Fluent Code. New method has been presented (without solving the combustion) with considering combustion as initial condition. To ensure that the accuracy of solution is obtained, validation has been done with a valve pulse jet engine that shows excellent results with less than 5 percent error. Eventually the main result shows that amount of parameters that has most impact on thrust is 29 for exhaust pipe, 1.25 for combustion chamber and 3.5 for intake pipe. The volume of combustion chamber should not exceed the limits otherwise it will be caused non-uniform pressure distribution and will be effect on engine performance.

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