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Micro-Nozzle Model Verification Through Schlieren and IR Photography
Keywords: micro-nozzle, schlieren, infrared
We are currently researching the use of ceramics to manufacture micro-propulsion devices. These devices consist of a sub-millimeter supersonic nozzle and a catalyst chamber. A solution of 85% pure hydrogen peroxide is pumped into the chamber, which is lined with silver metal. The silver catalyst reacts with the hydrogen peroxide, which is then emitted through the nozzle as a high temperature gas. The current nozzle dynamics testing is being done using nitrogen gas for safety purposes. We are using schlieren and IR photography to image the gas output of the nozzles for comparison with the CFD and thermal models used in the nozzle design. Using schlieren photography for comparison of shock cell shape and separation of model data versus experimental data will provide verification of our CFD models. Schlieren imagery is based on the refraction of light caused by changes in the density of the medium through which it passes. This method provides a black and white image of the emitted gases. During hydrogen peroxide testing we will use IR photography to analyze the temperature gradients of both the emitted gases and the outer walls of the catalyst chamber. This data will be compared to models of the expected temperature gradients.
Aaron Coulter, Lab Assistant
Boise State University
Boise, ID

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