This paper aims to design a novel experimental platform with multiple testing possibilities on different individual performance parameters and different rotary propulsion systems. Three mechanic swingarms were constructed to separately and simultaneously test the rotor(s) and shroud, so that the interactions among different components can be involved. Based on it, measurements on the total thrust, torque, and power were conducted to evaluate the system global performance and the effects of key design parameters. The test results indicate that the performance parameters such as total thrust, torque, power, and power loading of the shrouded double rotor (SDR) are asymmetric between the current system and the one with switched rotational speed. Compared with free rotors, the shroud presence can increase the total thrust by 61.2% and power loading by 60%; the combination of divergent nozzle and, relatively, great inlet can improve the system performance, but it is limited by the flow separation; the system behaves insensitively to the rotor locations and rotor number. The location at the upstream cylindrical section is recommended; the optimal performance usually occurs under the condition of the upstream rotational speed lower than the downstream one. All revealed phenomena and the effectively designed test platform give the technique references for the shrouded system design and optimization.

中文翻译：

---

基于具有多种测试可能性的新型设计平台的带罩对转转子的性能评估

本文旨在设计一个新颖的实验平台，在不同的个人性能参数和不同的旋转推进系统上具有多种测试可能性。三个机械摆臂被构造成分别和同时测试转子和护罩，以便可以涉及不同部件之间的相互作用。在此基础上，对总推力、扭矩和功率进行测量，以评估系统全局性能和关键设计参数的影响。测试结果表明，当前系统和切换转速的系统之间，护罩双转子（SDR）的总推力、扭矩、功率和功率负载等性能参数不对称。与自由转子相比，护罩的存在可使总推力增加 61。2% 和 60% 的功率负载；发散喷嘴与相对较大的进气口的组合可以提高系统性能，但受到流动分离的限制；该系统对转子位置和转子数量不敏感。推荐在上游圆柱段的位置；最佳性能通常发生在上游转速低于下游转速的条件下。所有揭示的现象和有效设计的测试平台为遮罩系统的设计和优化提供了技术参考。推荐在上游圆柱段的位置；最佳性能通常发生在上游转速低于下游转速的条件下。所有揭示的现象和有效设计的测试平台为遮罩系统的设计和优化提供了技术参考。推荐在上游圆柱段的位置；最佳性能通常发生在上游转速低于下游转速的条件下。所有揭示的现象和有效设计的测试平台为遮罩系统的设计和优化提供了技术参考。