The invention discloses a wind tunnel test method for measuring an unsteady aerodynamic coefficient in the take-off and landing process of an airplane, and belongs to the technical field of wind tunnel tests. According to the method, the test model moves according to the preset take-off and landing process in a forced movement mode, the take-off and landing process of a real aircraft is divided into a plurality of infinitesimal elements, it is guaranteed that the geometric shape of the test model is similar to that of the real aircraft, and due to the fact that the wind speed is fixed and the Slodhaar numbers in the time periods of all the infinitesimal elements are equal, the wind speed is stable. In other words, the dimensionless time constants in all the infinitesimal time periods are equal, the maximum pitch angle speed, the maximum heaving speed and other limit indexes in the rising and landing process simulation process are obtained through differential calculation, and the limit indexes are compared with indexes of a test system; therefore, the aerodynamic coefficient influenced by the unsteady ground effect in the takeoff and landing process of the real aircraft is directly obtained, and the problem that the unsteady aerodynamic coefficient in the takeoff and landing process of the real aircraft cannot be effectively obtained in a traditional ground effect wind tunnel test is solved. The method has the advantages of high traceability and high universality.
本发明公开了一种测量飞机起降过程中非定常气动力系数的风洞试验方法,属于风洞试验技术领域。本发明通过强迫运动的方式,使试验模型按照预定的起降历程进行运动,将真机的起降历程分成若干微元,保证试验模型与真机几何外形相似,由于风速固定不变,每个微元时间段内的斯特劳哈尔数相等,即每个微元时间段内的无量纲时间常数相等,通过微分计算获得起降历程模拟过程中最大俯仰角速度和最大升沉速度等极限指标,将以上极限指标与试验系统指标进行对比,从而直接获取真机起降过程中受非定常地面效应影响的气动力系数,解决了传统地面效应风洞试验无法有效获取真机起降历程中非定常气动力系数的问题;具有可追溯性强、普适性高的优点。
Wind tunnel test method for measuring unsteady aerodynamic coefficient in take-off and landing process of airplane
测量飞机起降过程中非定常气动力系数的风洞试验方法
21.04.2023
Patent
Elektronische Ressource
Chinesisch
IPC: | G01M TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES , Prüfen der statischen oder dynamischen Massenverteilung rotierender Teile von Maschinen oder Konstruktionen / B64F GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT , Boden- oder Flugzeugträgerdeckeinrichtungen besonders ausgebildet für die Verwendung in Verbindung mit Luftfahrzeugen |
Helicopter landing aerodynamic characteristic wind tunnel test method
Europäisches Patentamt | 2023
|Airplane take-off and landing paths
Engineering Index Backfile | 1967
|Model wind tunnel virtual flight test aerodynamic coefficient measurement method
Europäisches Patentamt | 2022
|