中文摘要：

提出一种用于涡旋流体机械的渐变壁厚且渐变啮合间隙的涡旋齿型线，由变径基圆渐开线及其法向等距曲线组成；其特点是;从中心齿头到外圈齿尾涡旋齿壁厚逐渐减小，所形成的压缩腔在通向排出口方向存在啮合间隙；可用于气液混合增压或喷液气体压缩，防止压缩过程中出现压缩腔内气液介质压力骤增的问题；与等壁厚涡旋齿相比，该涡旋齿应力分布合理、涡旋齿变形小。将该涡旋齿应用于气液多相混输，通过数值模拟得到其工作腔的压力场、速度场的分布规律；分析了气液比、出口压力和转速对工作过程的影响。将介质压力场分布作为边界条件，得到了该涡旋齿在介质压力作用下的应力分布和变形规律。

英文摘要：

A novel tapered meshing clearance and thickness scroll wrap for scroll fluid machinery was proposed, which is composed of changing radius circle involutes and its equidistant curve. Its thickness gradually decreases from the head to the end of scroll wrap, and the formed compression chambers have meshing clearance to discharge port. When this proposed scroll wraps are used for gas liquid mixture transportation or gas compression with liquid injection, pressure surge can be effectively avoided. Compared with equal-thickness scroll wrap, the proposed scroll wraps have advantage of smaller stress and deformation. The proposed scroll wrap can be applied in the scroll multiphase pump for gas-liquid transportation; and through numerical simulation, the pressure fields and the velocity fields are obtained, as well as the influences on working process under different gas liquid rate, discharge pressure and rotational speed are analyzed. The stress and deformation distribution laws of the scroll wrap with the act of pressure are calculated.