6. A stealth aircraft has a fuselage profile that can be simplified to the diagram below....
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6. A stealth aircraft has a fuselage profile that can be simplified to the diagram below. The flow moves from point (1) to point (2) across a 14° compression corner then point (2) to (3) across a 33º expansion corner. (1) (2) (3) (a) Describe the phenomena that will occur at the nose of the aircraft given the nose angle is 59° from the direction of the flow. State evidence to support your description. [5 marks] (b) The aircraft is fitted with a pitot tube which is measuring 5.99 x 104 N/m² in region 1. The aircraft is at an altitude of 35km where the following can be assumed about the flow properties: temperature = 246.09°K, atmospheric pressure = 583 Pa, and density = 0.00826 kg/m³. Calculate the velocity of the aircraft. (i) Point (2) (ii) Point (3) [8 marks] (c) Assuming the Mach number from part (b) occurs at point (1) in the diagram, determine the Mach number and Pressure at: [6 marks] [6 marks] 6. A stealth aircraft has a fuselage profile that can be simplified to the diagram below. The flow moves from point (1) to point (2) across a 14° compression corner then point (2) to (3) across a 33º expansion corner. (1) (2) (3) (a) Describe the phenomena that will occur at the nose of the aircraft given the nose angle is 59° from the direction of the flow. State evidence to support your description. [5 marks] (b) The aircraft is fitted with a pitot tube which is measuring 5.99 x 104 N/m² in region 1. The aircraft is at an altitude of 35km where the following can be assumed about the flow properties: temperature = 246.09°K, atmospheric pressure = 583 Pa, and density = 0.00826 kg/m³. Calculate the velocity of the aircraft. (i) Point (2) (ii) Point (3) [8 marks] (c) Assuming the Mach number from part (b) occurs at point (1) in the diagram, determine the Mach number and Pressure at: [6 marks] [6 marks]
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