In order to make the power level angle(PLA)have the same bijection relationship with the thrust when the environment changes before operational limit exceedance,and ensure the pilot's ability of unrestricted throt...In order to make the power level angle(PLA)have the same bijection relationship with the thrust when the environment changes before operational limit exceedance,and ensure the pilot's ability of unrestricted throttle movement as well as the safety of the engine,a method used to design a constant thrust power schedule was proposed.The research was based on a simulink turbofan engine model and the results were organized as look-up tables in different structures with limitations.Simulation was done to confirm the validity and demonstrate the effectiveness of the schedule obtained with the approach.The constant thrust takeoff schedule,constant thrust idle schedule and constant thrust part power schedule with the present constant thrust control(CTC)method were proved to be valid.The results can be applied to this specific engine but the method can be applied to any areoengine and can be even extended to the unmanned plane.展开更多
为对比研究波浪中的实船功率及失速预报方法,以一艘19 000载重吨多用途船为试验对象,开展迎浪规则波中的阻力和自航试验,并分别采用国际拖曳水池会议(International Towing Tank Conference,ITTC)推荐的扭矩转速法(Torque and Revolutio...为对比研究波浪中的实船功率及失速预报方法,以一艘19 000载重吨多用途船为试验对象,开展迎浪规则波中的阻力和自航试验,并分别采用国际拖曳水池会议(International Towing Tank Conference,ITTC)推荐的扭矩转速法(Torque and Revolution Method,QNM)、推力转速法(Thrust and Revolution Method,TNM)、阻力推力一致法(Resistance Thrust Identity Method,RTIM),以及对TNM和RTIM提出的经验修正方式进行失速预报。对比发现:采用这些方法得到的失速预报结果在低海况下基本相近,均在工程允许的精度范围内;受线性波假设影响,波高较高情况下的失速预报结果一般偏大。提出的RTIM经验修正方式考虑了相对旋转效率的影响,适当减小了预报值,且其预报结果与QNM和TNM更接近,证明了其合理性。在实际工程应用中,为节约试验时间与成本,建议采用该方式进行失速预报。展开更多
文摘In order to make the power level angle(PLA)have the same bijection relationship with the thrust when the environment changes before operational limit exceedance,and ensure the pilot's ability of unrestricted throttle movement as well as the safety of the engine,a method used to design a constant thrust power schedule was proposed.The research was based on a simulink turbofan engine model and the results were organized as look-up tables in different structures with limitations.Simulation was done to confirm the validity and demonstrate the effectiveness of the schedule obtained with the approach.The constant thrust takeoff schedule,constant thrust idle schedule and constant thrust part power schedule with the present constant thrust control(CTC)method were proved to be valid.The results can be applied to this specific engine but the method can be applied to any areoengine and can be even extended to the unmanned plane.
文摘为对比研究波浪中的实船功率及失速预报方法,以一艘19 000载重吨多用途船为试验对象,开展迎浪规则波中的阻力和自航试验,并分别采用国际拖曳水池会议(International Towing Tank Conference,ITTC)推荐的扭矩转速法(Torque and Revolution Method,QNM)、推力转速法(Thrust and Revolution Method,TNM)、阻力推力一致法(Resistance Thrust Identity Method,RTIM),以及对TNM和RTIM提出的经验修正方式进行失速预报。对比发现:采用这些方法得到的失速预报结果在低海况下基本相近,均在工程允许的精度范围内;受线性波假设影响,波高较高情况下的失速预报结果一般偏大。提出的RTIM经验修正方式考虑了相对旋转效率的影响,适当减小了预报值,且其预报结果与QNM和TNM更接近,证明了其合理性。在实际工程应用中,为节约试验时间与成本,建议采用该方式进行失速预报。
