Two Layer Hydraulic Analogy Method for Testing Supersonic Gas Flows with Shock Waves.
Patent, Filed 14 May 82, patented 14 Feb 84,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A method of studying steady and unsteady supersonic gas flow uses a two layer hydraulic analogy technique, The method simulates the specific heat ratio of the gas. Two layers of immiscible liquids having different densities and thicknesses are held in a shallow container. The densities are chosen and the layer thicknesses are adjusted to simulate the specific heat ratio of the gas. A model of a device to be studied is submerged in the liquid. Relative flow is caused to occur between the model and liquid simulating steady flow. The depth of the lower layer during the period of relative flow is measured and is analogous to steady state gas flow characteristics. For studying unsteady flow two bodies of liquids each having two layers of liquids of densities chosen lower layer thicknesses adjusted to simulate the specific heat ratio of the gas and to simulate a high and low pressure across a gas system are held in a container separated by a removeable gate. Flow is caused to occur from the high to low pressure liquid body simulating unsteady flow. The depth of the lower layers during the period of flow is analogous to unsteady gas flow characteristics.
- Test Facilities, Equipment and Methods
- Fluid Mechanics