The improvement of the Wind Thunder jet engine and the Wind Thunder turboprop engine is also almost carried out, in fact, it is just the addition of an air cooling system, such a small change under the guidance of Thunder, it only took half a month to complete. After the first thunderstorm jet engine was equipped with this cooling system, it will usher in a second long-lasting test run. The turbine blade crack appeared after only less than half of the design service life of the last long-lasting test run, and whether this problem can be completely solved after improvement is a common concern of all those involved in the development and test.

After the test run of the whole machine, the state of coordination and matching of various components was achieved, and in the operation test, the performance indicators of the wind and thunder jet engine were basically reached, and only the final durability test had problems. However, it is the most difficult problem in the durability problem, so this durability test is related to the development progress of the Fenglei series engine.

After World War II, before the seventies, aero engines needed to undergo adjustment tests, high-altitude tests and environmental tests under certain conditions before they were tested for durability. However, in this era, there is no condition for high-altitude test bench test, because to build a high-altitude test bench, the investment is very large, and with the technical level of this era, it is not up to the requirements of the high-altitude test bench. Therefore, after the adjustment test, the wind and thunder jet engine has entered the long-lasting test run, that is, the durability test stage.

In the durability test, it is not to say that the prototype should be kept running until the specified 90 hours or 150 hours, but it is divided into several stages, each of which is a few hours, and it is divided into several cycles, and no parking is allowed at each stage of the division. At the end of each test run, the engine is disassembled to check for wear and deformation of all parts and measured. Flaw detection and documentation of all faults. The performance data of the engine should be recorded before and after the test, and the performance data before and at the end of the test should be compared in order to analyze the degradation of engine performance.

This time, by adding an air cooling system, no one knows whether the Thunder jet engine will be able to withstand 90 hours of test running again.

The protracted test was divided into 15 phases, each with a test time of 6 hours. In the first hour, it is necessary to repeatedly test the performance data of four working states, including the slow train working state, the maximum continuous working state, the intermediate state and the maximum thrust state. This one is repeated five or six times. Then in the second hour, you have to slowly accelerate from the slow state to the maximum thrust state. In the third hour, in addition to the same test procedure as in the first hour, the performance data of the maximum thrust reverser state is finally tested. This is done through trial and error until the end of the 6th hour of a phase of the trial.

This shows how complicated the testing of jet engines is!

The second protracted test finally began at the beginning of March 1933! Xiao Weiguo and Messerschmidt personally presided over the test run, after all, this is related to whether the wind and thunder engine can be installed and tested in the next stage according to the development plan! Only after the installation test flight can the Fenglei series engine be finalized and put into mass production. At present, many aircraft manufacturers are eyeing the wind and thunder jet engine, hoping to buy this epoch-making aviation power. Thus designing more advanced aircraft.

The whole test bench is also very large, after all, the thrust of the jet engine is huge, if there is no enough stable test bench, and a series of measurement equipment, there is no way to carry out the test, and there is no way to obtain thrust and other performance data. Dozens of meters away from the test bench, there is also a test operation room, in which many instruments are distributed. You can clearly see the engine movement.

At 10 a.m., the second long-lasting test finally began! Test run on the test bench. The wind and thunder jet engine needs to be rotated with a starter, and when it reaches a certain speed, it will start to inject fuel for ignition, and then gradually increase the fuel supply, and the gas temperature will gradually increase when it reaches a certain temperature. When the power emitted by the turbine is equal to the power consumed by the compressor, the turbine begins to have the conditions to drive the compressor. In this way, the turbine and the starter jointly drive the compressor to rotate, and then continue to increase the oil supply, and the turbine power is further increased, when the turbine work has a certain reserve. The starter can be disconnected, the engine will enter the slow state on its own, and the starting process will end.

The testers checked the prototype of the first typhoon jet engine and all the equipment on the test bench again, and only after confirming that it was correct, did they report to Messerschmidt and Xiao Weiguo that the test was ready. Messerschmidt and Xiao Weiguo glanced at each other, and both of them nodded, deciding whether the wind and thunder engine could successfully complete the test of long-lasting test runs!

Xiao Weiguo said loudly: "The operator and the test personnel are ready, in accordance with the long-lasting test operation procedures, and the test will start immediately!" ”

With Xiao Weiguo's order, the operator immediately started the starter on the test bench, and then ignited successfully, the sound at this time was not too loud, just the operation of the starter and compressor. However, when the operator increased the fuel supply, the movement on the test bench became louder and louder, and finally when the compressor and turbine were fast turning and ready to enter the slow train, the operator cut off the starter. At this time, the temperature and velocity of the tail nozzle of the wind and thunder jet engine are relatively high, and it can be clearly seen that the air near the tail nozzle is constantly changing shape.

As the fuel supply continued to increase, the wind and thunder jet engine made a louder and louder whistling sound, dull as thunder! And its tail nozzle also shoots out a wake at high speed with the increase of thrust, reaching dozens of meters away! The entire test bench was trembling, which shows how great the thrust of the wind and thunder jet engine is! It's like an eagle that wants to spread its wings and fly high, trying to break free from the shackles of the test bench! After the change from slow to maximum thrust, the Thunder jet engine still performed well, and all parameters were displayed normally during the test, which can be clearly seen from the various instruments in the operating room.

At this time, a big stone hanging in everyone's hearts finally landed. At least after adding a set of turbo cooling system, the whole engine did not appear any abnormalities, so it is only necessary to see if there is any problem with the turbine blades of the wind and thunder engine after 90 hours of long-lasting test run in various stages, and if the blades are finally checked to have no cracks or deformations, then it proves that this cooling system is successful! The Wind and Thunder jet engine can also enter the final test, the installation flight test. (To be continued.) )