Chapter 988 Meeting an Opponent
Actually, Chang Haonan was also a little interested in this symposium.
It's not that he was worried about the outcome of Yan Zhongcheng's battle with the opponent, so he had to play in person.
Mainly just to satisfy my curiosity.
Before, he only understood the general situation of 052C from the words of Lin Qing and Wang Xiaomo.
It’s not clear what this key model, a link between past and present, looks like now.
Since the Navy has put forward the idea of "continuing to improve the 052C", the updated 052D should at least have an overall plan.
Considering that the power of two QC300s is 20% more than that of two GT25000s, this model is likely to choose a more radical design solution.
Of course, with Chang Haonan's current position, if he specially sent a letter to ask, he would definitely get a response.
But if we work hard just for such a thing, it seems a bit unworthy...
However, interested is interested.
Since the Naval Equipment Department specially held such a meeting before the formal selection, and only invited technical personnel at the institute level to participate, it is obvious that it wants to reduce the impact of the two major military systems to a certain extent. The non-technical impact of senior management on the selection results.
Chang Haonan, as the chief designer of Turbofan 10, is in a special situation and can of course be interpreted as a technician.
But this is breaking the rules of the game——
The Aviation Power Group has sent a leader, so for the sake of reciprocity, does the Shipbuilding Industry Group of another company also have to send a leader?
As soon as you two sit there, the Naval Equipment Department will be a little overwhelmed. So do the general assembly and navy chiefs also need to be present?
What other symposium is there?
Just make the selection in advance...
Therefore, Chang Haonan finally suppressed his eagerness to try.
……
The symposium is scheduled for February 26, three days later.
The situation is similar to what Chang Haonan estimated before.
The leading roles are the Aviation Power Institute 606 and the Shipbuilding Industry Institute 703.
However, the other research institutes invited were not entirely foils.
Because the theme of this symposium is strictly speaking "Development of Ship Power System".
In addition to the core gas turbine, gearboxes, propulsion systems, cruise diesel engines, power generation auxiliary engines, etc. were also included in the discussion.
Of course, not every one of them involves selection issues.
Currently, China’s scientific research resources are still relatively limited, and it is simply impossible to afford free competition among multiple parties in all fields.
As for private enterprises...
Private enterprises at the beginning of the 21st century have no hope at all.
In fact, according to the original plan, even the gas turbine should have only one option.
You know, Huaxia came into contact with UGT25000 from Ermao in the early 1990s, and a few years later decided to use it as the power system of 052B/C and localize it.
By this time in 2002, this project had been progressing step by step for about five or six years.
However, a competitor that no one expected came out halfway -
When Chang Haonan was establishing the Aviation Power Group, he said that he would develop a 30-megawatt aeroderivative combustion engine. Machine, this is something everyone knows.
But the problem is that to change aviation, you must first have aviation.
The common estimate in the industry at that time was that the Turbofan 10 would be completely finalized around 2005.
After a period of stability, the project was initiated to develop an aeroderivative gas turbine, and then it was not until 2010 that the gas turbine was finalized.
In other words, everyone feels that the high-power gas turbine of the Aviation Power Group should be prepared for the next generation of brand new surface ships.
As a result, even Chang Haonan did not expect that the production of Turbofan 10 could be finalized so smoothly that he could start considering the design of QC300 in early 2002... which disrupted the Navy's previous equipment update plan. .
For Institute 703, which has already studied GT25000 extensively, this matter is even more outrageous.
While eating hot pot and singing songs, the project I got was suddenly blocked.
How can I bear this?
Therefore, when the symposium came to the topic of gas turbines, Wen Xueyou, the chief engineer of the 703 Research Institute in charge of GT25000, directly presented the results of these years of visiting...
"I believe that comrades in the Navy are already very familiar with the performance of the UGT25000 prototype. I will only give a brief introduction here. It has currently been tested on the 052B Type 168 ship, and its performance is fully in line with expectations. Type 052C, which has entered the equipment outfitting stage, also uses this model..."
"..."
Compared with QC300, the main advantage of GT25000 is that the situation is known , and is available almost immediately.
Thanks to the rapid progress of the overall level of China's machinery industry on this timeline, the latter's localization process has been almost smooth sailing since the turn of the millennium.
After a brief background introduction, Jacky Wen quickly entered the topic of today:
“The next thing I want to focus on is that while we are domestically producing the GT25000, we are also improving and upgrading it.” Based on the complete machine model and the two-dimensional component-level model, we conducted a theoretical study on the feasibility of adding an intercooling heat recovery system."
"After that, we also conducted a 401A based on the research results. The gas turbine underwent intercooling recuperation modification and completed the preliminary program demonstration as a technical demonstrator. "
"According to the test results, its thermal efficiency increased by about 3.8% and its output power increased by about 5% compared with before the modification... ”
“……”
The development direction of marine gas turbines is tangible, so it is expected that Institute 703 will also consider the intercooled heat recovery system as a future upgrade route.
It is even more logical to take advantage of my experience in marine power to develop a prototype prototype as early as possible.
Therefore, after Jacky Wen finished introducing this part, he glanced at Yan Zhongcheng sitting below from the corner of his eye, and found that the latter did not seem to show any emotional fluctuations.
This made him a little worried.
However, Jacky Wen quickly adjusted his mentality.
Because, there is another "free trick" later.
He turned the PPT to the next page.
The above is the title of the second part:
Adaptive Processing Receiver.
“On the other hand, compared with aero engines, marine gas turbines, while pursuing higher efficiency under design conditions, also require better stability at non-design speeds. Therefore, it is necessary to ensure that marine gas engines While the machine has high efficiency at high speeds, its actual operating stability under lower working conditions should also be specifically considered.”
After a brief pause, Jacky Wen continued to introduce:
“For this reason, we designed an adaptive processing casing while trying to keep the core components as common as possible. There are openings at the leading edge and the trailing edge, and they are connected in the middle by a bridge structure. The pressure difference between the front and rear openings is used to make the airflow near the rear opening open forward, thereby changing the core of the tip clearance vortex and effectively weakening the tip leakage. The generation of secondary flow..."
"This design can take into account compressor efficiency and stability margin, and is suitable for blocking stalls and tip overload stalls in cusp stalls, as well as modal stalls. "
“According to simulation tests, when the compressor is in modal stall, the new adaptive casing can expand stability by up to 2%, and when the compressor stall type changes to cusp stall, the stability expansion effect can reach up to 2%. 6%. Overall, it can increase the average thermal efficiency of the steam turbine by 3.5% under conditions below 50% speed, while the efficiency at the design point is only reduced by 0.23%, which will have almost no adverse effects..."
Yan Zhongcheng was quietly listening to Jacky Wen’s introduction below, his expression gradually becoming playful——
The other party just mentioned the difference between marine gas turbines and aviation engines, obviously to emphasize their lack of experience in the field of marine power.
Of course, we must admit that this adaptive receiver technology is indeed quite clever.
Using a relatively small cost, it achieves both high and low speed performance of the gas turbine.
It solves a huge pain point of gas turbine power.
If I had come to the meeting earlier, I might not have been able to come up with any good solutions.
But now, the situation is different——
Three days ago, the multi-level adjustable static leaf matching technology proposed by Mr. Chang seemed to have the same goal but a tit-for-tat meaning...
< br>(End of this chapter)