【摘要】 用速度梯度、压力梯度和环量梯度模拟大攻角尖前缘三角翼流场。外流场轴向减速和轴向逆压促进涡核的破裂,大的轴向环量梯度也促进涡核的破裂。分离涡的破裂是由于涡核内部诱导过大的轴向逆压或径向压差引起的,因而对涡破裂机理得到更完整的认识。在较大雷诺数条件下,才有可能出现轴对称型破裂涡。更多还原

【Abstract】 Velocity gradient,pressure gradient and circulation gradient are used to model the separated vortex flow field over a leading edge delta wing.The deceleration or adversed pressure of out-flow in the direction of x-axis promotes the breakdown of the vortex core,so does the larger circulation gradient in the direction of the axis.The induced larger adversed pressure gradient of the vortex core in the direction of axis or larger radial pressure difference results in the vortex breakdown,so the idea is more completely obtained about the vortex breakdown mechanism.The axisymmetric vortex breakdown can not take place until the Reynolds number becomes larger.更多还原