Если внимательно присмотреться, это сильно разные конструкции.
Ну как же... Они их вполне официально купили в Штатах еще при Дэн Сяопине, 35 лет назад, аж 24 штуки! Чудес не бывает...
Чего ж тогда так криво содрали?..
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aviationweek.com
China’s AECC Working On A Powerful Turboprop Engine
Sep 25, 2019Bradley Perrett | Aviation Week & Space Technology
Aero Engine Corp. of China (AECC) is laying the technological groundwork for development of a powerful turboprop engine for passenger or cargo aircraft in the 2030s. Work on the engine, the AEP500, is in the concept-design stage, company officials said at Aviation Expo China, held in Beijing on Sept. 18-20, where the new design was exhibited. Equivalent power, which includes exhaust thrust, will be at least 5,000 kW (6,700 equivalent shp), AECC said.
A technology-demonstration campaign is also underway and due for completion in 2025, when full-scale development is supposed to begin, the officials said. The aim is to achieve certification of the engine in 2035.
The lengthy timetable reflects the state enterprise’s limited experience in developing such engines, the AECC officials added.
The engine is being designed for a maximum cruise speed of at least Mach 0.6, a maximum operating altitude of 9,000-10,000 m (30,000-33,000 ft.) and fuel consumption at takeoff of no more than 260 grams/kW/hr. (0.43 lb./shp/hr.)
The AEP500 is being designed for maximum cruise speed of at least Mach 0.6
A gas generator will be tested as a turbojet
The Pratt & Whitney Canada PW150 is in the thermodynamic power class of 4,600 equivalent kW, says that manufacturer. The PW150 propels the Mach 0.6 De Havilland Canada Dash 8-400 regional airliner. An airliner with similarly high performance and the AEP500 would likely be at least as large as the Dash 8-400, which seats 74 passengers at 79-cm (31-in.) pitch. A more modestly performing aircraft with such an engine could seat 100 passengers.
“The development of new engines by other OEMs in this power range is a positive sign of a growing regional aviation segment,” Pratt & Whitney Canada said in response to the news of AECC’s program.
The ATR 72 is powered by the PW127, with thermodynamic power of 2,400 equivalent kW, according to Pratt & Whitney Canada.
The AEP500 is aimed at civil applications, the officials said. The AECC is satisfied from studies that there is a sufficient civil market. Those studies were presumably based on discussions in which Avic outlined its plans for turboprop aircraft of the 2030s, potentially based on the MA700, due for certificaiton in 2022. The MA700 is powered by the PW150C, which Pratt & Whitney Canada says generates 3,700 kW shaft (not equivalent) power. The officials particularly emphasized the possibility of using the AEP500 for a freighter. The officials particularly emphasized the possibility of using the AEP500 for a freighter.
AECC’s operation at Zhuzhou, in the south-central province Hunan, is handling the AEP500 project. The Zhuzhou establishment specializes in turboshaft and turboprop engines.
The AEP500 design features a highly loaded four-stage low-pressure compressor. Credit: Bradley Perrett/AW&ST
The AEP500 uses the three-shaft layout favored by Rolls-Royce, which provides compactness and, in principle, good performance retention at the expense of complexity. At the exhibition, AECC displayed a half-scale model of a gas-generator technology demonstrator for the AEP500. Since it will lack the third shaft and attached power turbine, the demonstrator will be, in effect, a turbojet. One official said it will probably be run in 2022 or 2023.
In the complete engine, the low-pressure compressor is intended to have four highly loaded axial stages, while the high-pressure compressor has one axial and one centrifugal stage. The combustor is described as short, annular, inclined and designed for straight flow. The high-pressure and low-pressure turbines each have one stage of single-crystal blades, and the power turbine has three stages.
The shafts counter-rotate. Piping for such functions as anti-icing and oil supply are integrated into the case.
Despite the avowed civil focus of the program, a turboprop could also be used in a military airlifter. Officials elsewhere in the Chinese aviation industry have said the air force has some interest in acquiring a new airlifter type smaller than the Avic Xian Y-20, a jet of 200 metric tons gross weight that entered service in 2016. Yet there can be no definite air force plan to use the AEP500: If there were, AECC would be forbidden from exhibiting it.
In 2013, a 5,000-kW turboprop engine from the Zhuzhou works, the WJ-10, was intended for an airlifter called the Y-19, according to information that was published by conference organizer Galleon and almost certainly sourced from the engine industry. Two years earlier, the Zhuzhou establishment had exhibited a turboshaft engine that it said was in the 5,000-kW class.
Conceivably, the WJ-10 was a turboprop version of the unnamed turboshaft. Either way, it may well be in development for service in the 2020s, since the air force, if it wants a turboprop airlifter, will not want to wait until the 2030s for the AEP500. An airlifter with a 5,000-kW engine could be expected to weigh perhaps 110 metric tons at takeoff unless designed for unusually high performance, like the Airbus A400M Atlas.
At Airshow China in Zhuhai in 2014, Avic exhibited a concept for a four-turboprop, 80-metric-ton airlifter, which officials then said could be powered by the WJ-16. In 2013, that engine was expected to generate 3,782 kW. Its status is unknown.
Решили использовать схему Д-27? Запорожцы в деле?
Chinese Stealth Bomber Wind Tunnel Model Emerges And It Looks Very Familiar
It's no surprise that China would take a high interest in understanding everything it can about the world's only operational stealth bomber.
BY TYLER ROGOWAY OCTOBER 26, 2019
Photos that depict a flying wing stealth bomber wind tunnel test article have emerged out of China. What's immediately most noticeable about the subject in the images is that it directly represents America's B-2 Spirit stealth bomber. There has been some speculation that this is actually China's long-awaited H-20 stealth bomber design. While it's true that China is notorious for knocking off foreign designs through various forms of espionage, that fact doesn't mean what we are seeing is the H-20, quite the contrary, actually.
The H-20 is one of two stealth bomber designs that are currently in development in China, with the other being a smaller, regional deep-strike platform that likely has additional multi-role capabilities. Of the two, the H-20 is thought to be farthest along in development, with rumors about its imminent first appearance ramping-up in recent years.
The existence of such a capability would represent a giant leap in Chinese aerospace technological know-how. In essence, the People's Liberation Army Air Force would advance from an updated 60-year-old design based on the Soviet Tu-16 Badger, in the form of its H-6K bomber derivatives, to a stealth flying wing strategic bomber. Once China does unveil its H-20, it will enter an elite club made up of just two nations that have accomplished such a technological feat.
CHINESE INTERNET
With that being said, just because the photos show a direct copy of the B-2, it doesn't mean that it represents the H-20 design. By better understanding the world's only flying wing stealth bomber, China can better inform their own designs. Making a large aircraft like the B-2 controllable over a wide performance envelope is not a small accomplishment. China is deeply invested in unmanned flying-wing designs, but scaling up such a planform drastically presents a number of challenges. So, it makes sense that China would want to better understand everything they can about Northrop's B-2 not just to apply to the H-20's design, but also for their own general aeronautical knowledge base for future projects.
This is also true for the B-2's low observable design features and shaping. Foreign adversaries and friends alike can use what they know about the B-2's design to make radar cross-section (RCS) test articles in order to gain a better understanding of stealth shaping and what features lend themselves to defeating certain RF bands from certain aspects. This information can also be used to develop sensors to better detect stealthy aircraft, such as the B-2.
In other words, there is aerodynamic and low observable knowledge to gain by testing sub-scale models of adversary designs, both in terms of acquiring technological intellectual property and for building a better idea of how to counter the threat those designs and their unique features pose. In fact, this isn't the first B-2 wind tunnel model we have seen emerge out of China (see below).
https://twitter.com/TheDEWLine/status/614140953532698624
Steve Trimble@TheDEWLine
https://twitter.com/TheDEWLine/status/614140953532698624
Chinese academic paper shows B-2-ish stealth bomber model inside AVIC wind tunnel. http://www.sciencedirect.com/science/article/pii/S1000936115000138#gr2 …
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10:39 PM - Jun 25, 2015
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Copying the B-2 exactly to create the H-20 seems a bit odd, even for China, as well. Better low observable capabilities, higher altitude performance, and a simplified empennage design could be had by not including its saw-tooth trailing edge. This was added midway through he B-2's development at great cost to allow the aircraft to penetrate at low altitudes. You can read all about this design change and how the original B-2 planform design will likely mirror that of the B-21 Raider in this past special feature of ours.
CHINESE INTERNET
So, while it's possible that China could have gone with a direct knockoff of the B-2, it isn't all that probable, and these images don't prove that either way. What they do prove is that China continues to work to better understand the flying wing concept any way they can and, for all we know, these photos could have been taken yesterday or years ago.
Above all else, they are also a reminder that China wants to keep the world guessing about its future in the stealth aircraft production, as well as the arrival of its first stealth bomber onto the world stage.
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aviaforum.ru
Первые китайские серийные истребители J-10B и J-20 с двигателями с управляемым вектором тяги WS-10B
В китайском сегменте интернета опубликованы фотографии серийных китайских истребителей J-10B и J-20, которые оснащены новыми двигателями с управляемым вектором тяги -WS-10B/10С национальной разработки.
Ранее истребители данных типов оснащались двигателями российского производства типа АЛ-31ФН или его китайской лицензионной копией.
Первые китайские серийные истребители J-10B и J-20 с двигателями с управляемым вектором тяги WS-10B
В китайском сегменте интернета опубликованы фотографии серийных китайских истребителей J-10B и J-20, которые оснащены новыми двигателями с управляемым вектором тяги -WS-10B/10С национальной разработки. Ранее истребители данных типов оснащались двигателями российского производства типа АЛ-31ФН…dambiev.livejournal.com
www.aviaport.ru
Боюсь, что неверно...
