Chapter 987 Multi-stage Adjustable Stator Blade Matching Technology
In Chang Haonan’s view, after the precedent of QC130, let the navy and shipbuilding industry system accept the QC300, which is also designed by 606 and is also aeroderivative. , shouldn’t be a particularly difficult thing.
Yan Zhongcheng’s trip is most likely just for stability.
“Speaking of it, Mr. Yan.”
After talking about the serious matter of gas turbine selection, Chang Haonan couldn’t see off the guests right away, so he took this opportunity to chat with him about the matter. Problems with aviation diversion project approval:
"My idea for the specific research and development work of QC300 is...if you have no physical problems, you will continue to take the lead."
Hearing this proposal, Yan Zhongcheng was shocked and his eyes were A flash of bright color flashed in the middle.
Due to relatively complex historical factors, his efforts to attack academicians failed last year.
Originally, he actually no longer thought much about this matter.
But QC300 is purely a project developed by the Aerospace Power Group.
If you can serve as the chief designer...
It will definitely be a big help to break through the academician realm.
But in an instant, he had some worries:
"This..."
Yan Zhongcheng glanced at Chang Haonan:
"I asked the organization to take care of me. In the two years since the end of QC130, I have not had a lot of burdens, but I have recovered a lot. There must be no physical problems."
"It's just... the situation of the turbofan 10, after all. Or do you know better, and the entire core machine was developed by you..."
In other units, the leaders pick the peaches halfway.
But when it came to him, he actually picked the leader’s peach.
Although Chang Haonan does have more than 100 million peaches in his hand.
But it's still weird.
At least guilty.
However, before Yan Zhongcheng finished speaking, Chang Haonan waved his hand:
"The core machine of the turbofan 10 will have many uses in the future. I have many things to do. It’s impossible to handle every project personally, so I won’t have time to do anything else.”
“So... my main focus should be on the large bypass ratio turbofan. The next step is to wait until the technology of high-temperature alloys is developed to unleash the potential of the turbofan 10 as a fourth-generation core machine.”
"Moreover, although aviation power and ship power are both gas turbines in essence, when it comes to engineering, the difference is still quite big. In this regard, only Mr. Yan in our group has the successful experience of QC130, and you will definitely play an important role. "
Yan Zhongcheng didn't really want to do it, but he was just a little psychologically burdened. In addition, he had not directly participated in the research and development of the turbofan 10, which made him feel unsure.
Now that Chang Haonan has said this, it is impossible for him to continue to refuse.
So after hesitating for a moment, he nodded.
“Don’t have too much psychological pressure.”
Chang Haonan laughed when he saw this:
"I don't want to be a completely hands-off shopkeeper. I still have to be responsible for the work of grasping the boss..."
What this basically means is that he still knows how to do it. Serve as Chief Engineer.
Although in most cases, the chief engineer does not interfere with the technical details of the project, this is mainly due to the different division of labor.
As the top decision-maker and person in charge of the project, if the chief engineer is willing and has the ability, he can of course intervene in the design work when needed.
If a person like Chang Haonan were to be the chief engineer, he would basically play the role of a stabilizing figure and a technical backbone. "Mr. Chang, please stop scaring me..."
Hearing this, Yan Zhongcheng finally breathed a sigh of relief:
"To be honest, Turbofan 10 The other parts of the aeroderivative combustion are fine, either understandable, or like the combustion chamber, just use the test results as known items. Only the design of the high-pressure compressor, after I read the design plan, is still I’m confused...”
Although aeroderivative combustion is developed on the basis of the core aircraft engine, because the working conditions are so different, only the combustion chamber and turbine are often the only ones that change less.
Although the high-pressure compressor is also part of the "core engine", it often requires extensive modifications.
Especially after the introduction of intercooling heat recovery technology, the thermal management situation will become more complicated.
It is far from a problem that can be solved by putting a shell on the aviation engine and changing the calibration.
“Don’t be anxious about this.”
Chang Haonan pretended to be relaxed and leaned on the sofa:
"The foundation of QC300 is pretty good, so it is not difficult for the model life to last for decades. There is no need to do it all at once and use all the technologies at hand."
"The first step is to create a simple cycle Gas turbines to solve the most pressing problems of users, and then gradually add other cash technologies and gradually upgrade them."
"In addition, as for the compressor part you just mentioned..."
Originally, Yan Zhongcheng had gradually relaxed at this moment, but when he heard Chang Haonan suddenly talking about technical problems, his nerves suddenly became tense again:
"Mr. Chang, wait a moment..."< br>
He stretched out his hand to signal the latter to wait, and at the same time quickly took out the notebook and pen he carried with him from his bag:
"You continue."
Looking at the other party's silky expression After a small combo, Chang Haonan showed a dumbfounded expression:
"Actually, I just provide an idea, not any specific technical guidance..."
Having said that, Yan Zhongcheng has everything. It is placed on the coffee table, and it is impossible for anyone to put it away again.
So, he just explained casually, and then returned to the topic:
"You seem confused just because you don't know where to start. I can actually tell you specifically about the high-pressure compressor of the turbofan 10 How are some parts designed, including the margin left for the fourth-generation engine that will be upgraded to a thrust ratio of 10 in the future? These parts are actually not difficult..."
"But if it is used in the QC300 If I talk about it before the overall design is finalized, I am worried that... it will interfere with your thinking."
"I suggest Mr. Yan to change the angle and throw away everything except the combustion chamber and turbine. On the other hand, we design a set of axial flow compressors from scratch based entirely on the characteristics of naval gas engines. This way, we are less constrained and have a stronger training effect on the technical team.”
Yan Zhongcheng. He stopped writing thoughtfully, touching his chin while thinking about Chang Haonan's words.
"For example, compared with aerospace engines, marine gas engines are relatively less sensitive to weight, but they may need to work under lower operating conditions for a long time, especially if full-combustion power is used in the future."
“So, we can try to adopt the adjustable vane control strategy in the design level of the 7-stage high-pressure compressor, and provide the ideal angle of attack for the rotor of the subsequent stage by changing the vane angle, and establish the relationship with each stage. The inter-stage matching condition is adapted to the working condition load, allowing the engine control system to automatically select the most appropriate stator vane angle for different working conditions, improving the surge boundary and working efficiency."
"In addition, marine gas turbines. There is no need to consider performance optimization under supersonic operating conditions, so there is no need to consider the problems caused by too high a boost ratio. You can increase the total pressure ratio after removing the fan to 24, or even above 26, to increase the output power and Fuel economy..."
"In general, before officially establishing the project, you can consider doing some preliminary work with relatively low investment, such as using the relatively simple one-dimensional average streamline method to establish an aerodynamic parameter calculation model , and let’s see if we can cooperate with the Navy and local units that use other types of gas turbines to compile a model library for performance prediction.”
“In this way, variable dimensions will need to be built later. When building a gas turbine model, at least you don’t have to build the wheel from scratch..."
“Also, from a cycle perspective, simply placing an intercooler between the high- and low-pressure compressors will have a relatively small impact on the cycle process itself, but it can significantly reduce the compression power consumption of the high-pressure compressor. In this case, you can consider taking the lower inlet temperature into consideration when designing the high-pressure compressor..."
"..."
Although Chang Haonan said before, this is not specific technical guidance, but for older generation technicians like Yan Zhongcheng, things in the research and development direction are more important.
Therefore, the latter still picked up the pen and wrote down almost word for word what Chang Haonan said...
(End of this chapter)