In Problem 11.8, the critical Mach number for a circular cylinder is given as
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FUND OF AERODYNAMICS(LLF) +CONNECT (1YR)
- Example 2. A high-speed AC 130 gunship is flying at a pressure altitude of 10 km. A Pitot tube on the wingtip measures a pressure of 4.24 x 10ª N/m2. Calculate the Mach number at which the aircraft is flying. Solution: Solving for P1 at an altitude of 10000 m, we get 2.65 x 104 N/m2 k-1 1.4-1 Po k 4.24 x 104) 1.4 M? k – 1 - 1 - 1 1.4 – 1 2.65 x 104 M? = 0.719 M1 = 0.848arrow_forwardDerive an expression for the expansion coefficient of a perfect gas. Also derive an expression for the isothermal compressibility of a perfect gas.arrow_forwardsecond slide is data for the problem in slide 1arrow_forward
- The Born–Oppenheimer principle [1] is often said to be a prerequisite for the concept of a PES. Yet the idea of a PES [2] predates the Born–Oppenheimer principle (1927), Discussarrow_forwardNeed asaparrow_forward(b) An experimental balloon filled with helium is equipped with meteorological instruments is released to the atmosphere from sea level. Measurement data was analysed to derive the linear temperature lapse rate up to high altitudes above sea level. The lapse rate was found to be equal to 0.0065 K/m. Estimate the altitude of the balloon above sea level when the atmospheric pressure is equal to 60 kPa. Atmospheric temperature and pressure at sea level may be assumed to be equal to 15°C and 101 kPa. Characteristic gas constant is 287J/kgK.arrow_forward
- Anideal gas with a mass of 2 kg reversibly and polytropically expands up to 3 times its initial volume in a piston-cylinder assem bly. The temperature of the ideal gas drops from 300° Cto 60° C. (a) If the heat energy inputis 20 kJand the boundary work output is 100 kJ, the specificheats of the gas cv [kJ/ kgK] and find the cp [kJ/ kgK] values. (b) If the heat energy output is 20 kJand the boundary work output is 100 kJ, the specificheats of the gas cv [kJ/ kgK] (c) Find the value k, which is the ratio of specificheats. (d) If the heat energy input is 20 kJ, the boundary work output is 100 kJ and the entropy generation is 0.36 kJ/K, then the thermal energy Calculate the source tem perature as [° C].arrow_forwardWhat is the Mach Number of an air with a velocity of 250 m/s, at a temperature at 2800 meters?arrow_forwardNonearrow_forward
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