roldy Posted December 4, 2011 Posted December 4, 2011 I'm working on a hypersonic vehicle project and I have some questions regarding some results I have obtained. The scope of this project includes the calculation and plotting of the pressure, temperature, pressure coefficient, and drag coefficient on the surface of a blunt body. The three methods being used are the Newtonian Theory for a calorically perfect gas, Modified Newtonian Theory for a calorically perfect gas, and Modified Newtonian Theory for a thermo-chemical equilibrium gas. I have attached a zip file with these plots. I have also included a plot of the temperature distribution without the thermo-chemical equilibrium assumption. Looking at the temperature plot of all three methods, you can see that for the thermo-chemical equilibrium gas the curve is no where close to the other curves. For the pressure plot You can see that the curve is not as rounded as the others. This has got me questioning the procedure that I used. I'm thinking that I'm missing something conceptually. For the thermo-chemical equilibrium assumption, an iterative procedure is used. In all three methods, the local inclination angle of the blunt body is first found by simple arithmetic at each point. Then this angle is used as theta in the oblique shock relations equation to calculate what the Mach angle is. This Mach angle is then used to find the normal component of the flow velocity for use in the TCE iterations. I have attached a pdf file explaining this procedure. This procedure was explained in class by the professor. I should note that the professor mentioned that for the TCE assumption, the pressure distribution won't change much but the temperature distribution will. The question is by how much. Am I missing something with my procedure? procedure.pdf Archive.zip
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