PFR - Aerospace Engineering Sciences Senior Design Projects ...

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Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects Figure 44: Streamlines around the Aircraft with the Bottle The velocity magnitude around the airplane with four rockets on it is shown in Figure 45. Unlike the previous case described, the rockets are streamlined and therefore the disrupted airflow around them does not appear to be as severe. The flow around the trailing edge of the rockets is the slowest and the flow over the entire system is reasonably high (yellow/orange refers to higher speeds). Figure 45: Velocity Magnitude around the Aircraft with the Rockets The streamlines for the airplane carrying four rockets show that the flow around the entire system is smooth. This is expected since the airplane and the rockets are streamlined. This is seen in Figure 46: 74
Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects Figure 46: Streamlines around the Aircraft with the Rockets The drag estimates for the cases with the payloads on the airplane and the airplane without payload is summarized in Table 14: Table 14: Predicted System Drag for Flight Missions from PowerFLOW Flight Mission Reynolds Number Drag No Payload on Airplane 708923 1.03 lb 4 Rockets on Airplane 708923 1.43 lb Bottle on Airplane 708923 1.57 lb 2 Rockets on Airplane 708923 1.30 lb The analysis was set up to simulate cruise at expected flight conditions in the competition site, Tucson, Arizona. The maximum drag expected is 1.57 lb which is for the case with the bottle on the airplane. The results make intuitive sense, since the bottle is not streamlined and therefore disrupts the flow around it, causing more drag than the rockets. It is expected that the thrust available is more than required to overcome the predicted drag. This will be described in the propulsion section. Additionally, this drag prediction will be tested in flight for comparison purposes. This is detailed in the test and verification section. 75
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University of Colorado Design/Build
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