1. The SpaceX Merlin is a family of rocket engines developed by SpaceX for use on its Falcon 1, Falcon 9 and Falcon Heavy launch vehicles. Merlin engines use RP-1 and liquid oxygen as rocket propellants in a gas-generator power cycle. The Merlin engine was originally designed for sea recovery and reuse.
The injector at the heart of Merlin is of the pintle type that was first used in the Apollo Lunar Module landing engine (LMDE).
https://en.wikipedia.org/wiki/SpaceX_Merlin
a previous image of the engines from September 2019:
Elon Musk/Twitter
Compare it with the most recent image, and it seems the engines have slimmed down:
图片：https://www.inverse.com/innovation/spacexs-raptor-engines-are-evolving-rapidly-as-team-aims-for-mars
2. 火箭工程师及设计专家Thomas Mueller：
Thomas Mueller is an American rocket engineer and rocket engine designer. He is a founding employee of SpaceX, a space transport services company headquartered in Hawthorne, California.[1]
He attended the University of Idaho where he earned a bachelor's degree in mechanical engineering.[5] Mueller went on to attend Loyola Marymount University where he obtained his master's degree in Mechanical Engineering in 1992 from the Frank R. Seaver College of Science and Engineering.
He is best known for his engineering work on the TR-106, the Dragon spacecraft propulsion, and Merlin Rocket Engines. He is considered one of the world's leading spacecraft propulsion experts and holds several United States patents for propulsion technology.[2][3]
In late 2001, Mueller began developing a liquid-fueled rocket engine in his garage and later moved his project to a friend's warehouse in 2002.[1] His design was the largest amateur liquid-fuel rocket engine, weighing 80 lb (36 kg) and producing 13,000 lbf (58 kN) of thrust.[1] His work caught the attention of Elon Musk, PayPal co-founder and CEO of Tesla Motors, and in 2002 Mueller joined Musk as a founding employee of SpaceX.[2]
As Vice President of Propulsion Engineering and subsequently CTO of Propulsion at SpaceX, Mueller led the team that developed the Merlin 1A and Kestrel engines for the Falcon 1, the first liquid fueled orbital rocket launched by a private company; the Merlin 1C, Merlin 1D and MVac engines for the early iterations of the Falcon 9 launch vehicle; as well as the Draco thrusters that power the Dragon spacecraft. Dragon was the first spacecraft launched by a private company to dock at the International Space Station. In 2014, Mueller transitioned engine development to the SpaceX Propulsion Engineering team and in 2016 he moved into the Propulsion CTO (Part-Time) role. In January 2019 he became Senior Advisor (Part-Time).[7]
Outside his work at SpaceX, he was a commencement speaker for Loyola graduate students in 2013, the year after SpaceX became the first private company to send a cargo payload to the International Space Station.[6] He was also the feature of an article called "Rocket Man," published by LMU Magazine in 2011.[8] In 2014, Mueller was nominated for the Wyld Award, presented by the American Institute of Aeronautics and Astronautics (AIAA) for outstanding achievement in the development or application of rocket propulsion systems.[9]
https://en.wikipedia.org/wiki/Tom_Mueller?
3. Behind the Scenes With the World's Most Ambitious Rocket Makers
https://www.popularmechanics.com/space/rockets/a5073/4328638/
