On January 18, 2016, US military giant Orbital ATK announced that it successfully tested the 3D printed hypersonic engine combustion chamber at NASA's Langley Research Center. The results show that the analysis object not only meets or exceeds all test requirements, but the 3D printed hypersonic engine combustion chamber also creates a record of the longest duration of propulsion wind tunnel testing in its class.
According to Orbital ATK, without the metal 3D printing technology , the propulsion system components could not be manufactured at all. It is used in the manufacture of a powder bed fusion (the PBF) technology, is called selective laser sintering, or (the SLS), metal additive manufacturing technology uses a high power laser sintered metal powder layer by layer, build complex 3D solid metal structure.
“Additive manufacturing opens up new possibilities for our designers and engineers.†Pat Nolan, vice president and general manager of the missile division at Orbital ATK Defense Systems, said: “The combustion chamber is a good example of how many It was impossible to make it years ago. This successful test will encourage our engineers to continue to use these innovative tools to explore new designs, reduce costs and reduce manufacturing time."
In essence, metal 3D printing techniques, such as SLS, can create complex shapes that can simplify a structure that previously required multiple parts to be combined into a single, lower cost part without compromising its strength and structure. . At the same time, because the print objects are built layer by layer, advanced design features and components can be directly integrated into the design. According to China's 3D printing network, the 3D printed hypersonic engine combustion chamber, also known as the scramjet combustion chamber, is one of the most difficult parts in the propulsion system. It must be in an extremely unstable environment. Contains and maintains stable combustion. In this test, Orbital ATK's 3D printed metal parts were subjected to various high temperature hypersonic flight conditions in 20 days, including the longest duration of the propulsion wind tunnel test since the record – the final result proved no problem.
In fact, last week, the company also acquired a $241 million additive manufacturing R&D contract from the US Air Force with SpaceX to develop advanced prototypes for US-made rocket engines.
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