Compared with the NACA0012 cascade data, the NACA63012 combined cascade (B=24%, T=40%) CNymax increased by 16.3%, ANCymax increased by 0.8%; compared with the S-type airfoil, CNymax increased by 22.57%, and ANCymax increased. 5.22%. It can be seen that if the curved blade is used for the combined cascade of long and short blades, the forward performance must be greatly improved under the premise that the forward and reverse thrusts are basically the same. In the forward data of the NACA63012 combined cascade, the best operating point (B=24%, T=40%, A=12.1b), the Cy1 of the front row is 0.972, and the Cy2 of the latter is only 0.238. When B=80%, T=50%, A=11.3b, Cy1 is only 0.366, and Cy2 is 0.194. It is thus found that the change of geometric parameters of the blades in the front of the cascade is always more sensitive than that of the latter. In a certain range, even the change of the angle of attack has little effect on the Cx2 and Cy2 of the trailing cascade. A similar rule was found in the inverse data of the cascade.
The internal flow of the combined cascades is a preliminary study of the gas flow inside the combined cascades. In order to achieve the normal operation of the combined cascade, the internal airflow must meet the combined working conditions, that is, the airflow is on the exit section of the cascade, and the static pressure is equal along the parallel line. In this area, the rear half of the trailing blades have almost no function, and the exit wake of the preceding blades deteriorates the flow state. The area is a mixed area, and after the airflow enters the area, they are mixed with each other to finally meet the joint working conditions.
In fact, inserting the trailing blades into the flow field of the preceding blades is equivalent to introducing a series of point vortices in the flow field. These point vortices induce an effect on the amount of the preceding blades, and the size of the ring changes. Affects the lift level of the entire combined cascade. In the same way, the front row of blades also induces the amount of the trailing blade ring, but since the trailing cascade has only a small part of the load of the entire combined cascade, the fore-leaf cascade induction is not very obvious. In this paper, the change of the relative position of the front and rear cascade cascades, the rubber injection machine changes the mutual matching relationship and the induction of the front and rear cascade cascades, in order to find the best overall performance parameters of the combined cascade, and Corresponding relative positions of the front and rear column cascades. The above explanation is based on the experimental data, a general understanding and understanding of the combined cascade flow. In fact, the influence of cascade parameters on flow and performance is often the combination of several parameters on flow and performance, and it is difficult to isolate the influence of a certain parameter.
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