The key and bottleneck of research on the tip-jet rotor compound helicopter lies in the power system. Computational Fluid Dynamics (CFD) was used to numerically simulate the gas generator and rotor inner passage of th...The key and bottleneck of research on the tip-jet rotor compound helicopter lies in the power system. Computational Fluid Dynamics (CFD) was used to numerically simulate the gas generator and rotor inner passage of the tip-jet rotor composite power system, studying the effects of intake mode, inner cavity structure, propellant components, and injection amount on the characteristics of the composite power system. The results show that when a single high-temperature exhaust gas enters, the gas generator outlet fluid is uneven and asymmetric;when two-way high-temperature exhaust gas enters, the outlet temperature of the gas generator with a tilted inlet is more uniform than that with a vertical inlet;adding an inner cavity improves the temperature and velocity distribution of the gas generator's internal flow field;increasing the energy of the propellant is beneficial for improving the available moment.展开更多
针对风速随机性给风能转换系统(wind energy conversion system,WECS)带来的非线性和参数不确定性,提出了一种模糊自耦合PI控制方案用于低风速的最大功率点跟踪。自耦合PI被用来完成基本的转速跟踪,以实现对风力机尖速比的最优化控制。...针对风速随机性给风能转换系统(wind energy conversion system,WECS)带来的非线性和参数不确定性,提出了一种模糊自耦合PI控制方案用于低风速的最大功率点跟踪。自耦合PI被用来完成基本的转速跟踪,以实现对风力机尖速比的最优化控制。而模糊控制器则被用来获取自耦合PI在不同工作点下的控制参数,以提高系统对风速变化的适应能力。为了验证所提方案的可行性,在Matlab/Simulink搭建的2 MW风能转换系统仿真模型中开展了与传统方法的对比实验。仿真结果表明,相比于传统PI、模糊PI以及GA-PI,所提出方法拥有更佳的转速跟踪性能、更平滑的响应曲线以及更多的电能输出。展开更多
文摘The key and bottleneck of research on the tip-jet rotor compound helicopter lies in the power system. Computational Fluid Dynamics (CFD) was used to numerically simulate the gas generator and rotor inner passage of the tip-jet rotor composite power system, studying the effects of intake mode, inner cavity structure, propellant components, and injection amount on the characteristics of the composite power system. The results show that when a single high-temperature exhaust gas enters, the gas generator outlet fluid is uneven and asymmetric;when two-way high-temperature exhaust gas enters, the outlet temperature of the gas generator with a tilted inlet is more uniform than that with a vertical inlet;adding an inner cavity improves the temperature and velocity distribution of the gas generator's internal flow field;increasing the energy of the propellant is beneficial for improving the available moment.
文摘针对风速随机性给风能转换系统(wind energy conversion system,WECS)带来的非线性和参数不确定性,提出了一种模糊自耦合PI控制方案用于低风速的最大功率点跟踪。自耦合PI被用来完成基本的转速跟踪,以实现对风力机尖速比的最优化控制。而模糊控制器则被用来获取自耦合PI在不同工作点下的控制参数,以提高系统对风速变化的适应能力。为了验证所提方案的可行性,在Matlab/Simulink搭建的2 MW风能转换系统仿真模型中开展了与传统方法的对比实验。仿真结果表明,相比于传统PI、模糊PI以及GA-PI,所提出方法拥有更佳的转速跟踪性能、更平滑的响应曲线以及更多的电能输出。
