The flow-field around the reentry capsule inspired me of slowing down the capsule by creating vacuum behind it.
I had previously suggested using Dry Ice as reentry capsule fuel. Carbon Dioxide has the highest vapor pressure making it a good rocket fuel in presence of high heat. The outer shell of the capsule can be made of Aerospace Grade Aluminum which is light and conducts heat very well. Dry ice would be sandwiched between the outer and inner shell of the rocket.
As the capsule reenters the atmosphere, the air drag heats up the outer shell. Which turns dry ice into high pressure carbon dioxide. The pressurized gas would be laterally streamed from the back of the capsule. This would minimize the formation of recirculating flow at the back of the capsule which creates very low-pressure zone. The low pressure creates suction effect at the back and slows the rocket.
Finally, with no moving parts, the inside of the capsule would be kept cooler by dry ice shield and the capsule would be slowed down using dry ice lateral jet stream.
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