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Introduction
Recently, the three major engine manufacturers CFM, Pratt & Whitney and Rolls-Royce have submitted engine proposals for the future Boeing 797 (also known as NMA) to Boeing
Recently, the three major engine manufacturers CFM, Pratt & Whitney and Rolls-Royce have submitted engine proposals for the future Boeing 797 (also known as NMA). Rolls-Royce and Rolls-Royce have submitted engine proposals to Boeing for the future Boeing 797, also known as the NMA. Currently, the NMA-6X, which Boeing plans to deliver as early as 2025, can carry 228 passengers for a flight of 9,260 kilometers (5,000 nautical miles), and the Boeing NMA-7X, which will be delivered subsequently, can carry 267 passengers for a flight of 7,778 kilometers (4,200 nautical miles). These two Concepts will all evolve into the Boeing 797. Boeing hopes that the new NMA can save at least 25% in fuel consumption than the Boeing 757. According to usual practice, Boeing will decide to select one or two engine suppliers for NMA before the project is officially launched.
According to foreign media reports, Rolls-Royce’s plan is the boldest , and will use many new technologies to design this new engine named UltraFan.
▲ UltraFan gearbox design with variable pitch fan system provides effective power for future high thrust, high bypass ratio engines. The technology used is expected to be put into use in 2025, with fuel consumption and emissions reduced by at least 25% compared to the first-generation Trent engine.
GE may be an improvement over based on GE9X, the GE9X engine currently used to power the Boeing 777X.
▲ GE9X is the world's largest aeroengine, with a fan diameter of 3.4 meters and an inlet diameter of 4.5 meters. It is only 20 cm smaller than the diameter of the Boeing 767 aircraft fuselage and 76 cm larger than the Boeing 737 aircraft fuselage diameter. Its thrust It can reach 470 kN and has a bypass ratio of 10:1, which can save 10% to 15% of fuel consumption compared with the previous generation GE engine.
Pratt & Whitney's plan is also relatively conservative. will improve the design of the PW1100G engine used in the Airbus A321neo (applying scaling technology to increase the thrust to the 45,000 pounds required by Boeing).
▲ The new feature of the PW1100G motor is the use of a gear-driven fan system (FDGS). The fan casing and fan outlet guide blades are made of composite materials. The fan blades are made of hollow, multi-layer bonded aluminum-lithium material, and the leading edge is made of titanium alloy. Features damage-resistant layered braided blades. Engine takeoff thrust ranges from 24,240 pounds to 33,110 pounds. The PW1100G-JM series engines power the A320neo series aircraft.
▲Dennis Muilenburg, Chairman and CEO of Boeing, said that he hopes to use reintegrated engines with existing technology to reduce research and development risks. Currently, 1 in every 4 passenger aircraft coming off the assembly line Bought by Chinese customers.
Airbus predicts that the Boeing 797 is likely to compete mainly with the Airbus A321XLR for the market. The Airbus A321XLR is a medium-sized passenger aircraft with a maximum range of slightly more than 7,408 kilometers (4,000 nautical miles).
