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High-test peroxide
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High-test peroxide
High-test peroxide (HTP) is a highly concentrated (85 to 98%) solution of hydrogen peroxide, with the remainder consisting predominantly of water. In contact with a catalyst, it decomposes into a high-temperature mixture of steam and oxygen, with no remaining liquid water. It was used as a propellant of HTP rockets and torpedoes, and has been used for high-performance vernier engines.
Hydrogen peroxide works best as a propellant in extremely high concentrations, i.e., roughly, concentrations greater than 67%. Although any concentration of peroxide will generate some amount of oxygen and water in the form of hot gas, at such high concentrations, the heat of the decomposing hydrogen peroxide becomes high enough to completely vaporize any remaining liquid at ambient pressure. This represents an important safety and utilization threshold, as the decomposition of these high-concentration solutions above this is at risk of the liquid transforming entirely to heated gas: above this threshold, increasing concentration will release hotter gas. This high-temperature steam/oxygen mixture can be employed to generate thrust, power, or work, but is considered highly unstable, at risk of explosion in the presence of a strong initiating source, and a high hazard to health and safety.
Propellant-grade concentrations range from 70 to 99%, classified into four grades: of 71.0 to 73.0%, 85.0 to 87.0%, 89.5 to 91.0%, and 98.0-99.0%.
The volumetric change of peroxide due to freezing varies with percentage. Lower concentrations of peroxide (45% or less) will expand when frozen, while higher concentrations (65% or greater) will contract.
Hydrogen peroxide becomes more stable with higher peroxide content. For example, 98% hydrogen peroxide is more stable than 70% hydrogen peroxide. Water acts as a contaminant, and the higher the water concentration the less stable the peroxide is. The storability of peroxide is dependent on the surface-to-volume ratio of the materials the fluid is in contact with. To increase storability, the ratio should be minimized.
When used with a suitable catalyst, HTP can be used as a monopropellant, or with a separate fuel as a bipropellant.
HTP has been used safely and successfully in many applications, beginning with German usage during World War II, and continues to the present day. During World War II, high-test peroxide was used as an oxidizer in some German bipropellant rocket designs, such as the Walter HWK 509A rocket engine that powered the Messerschmitt Me 163 point defense interceptor fighter late in World War II, comprising 80% of the standardized mixture T-Stoff, and also in the German Type XVII submarine.
Some significant United States programs include the reaction control thrusters on the X-15 program, and the Bell Rocket Belt. The NASA Lunar Lander Research Vehicle used it for rocket thrust to simulate a lunar lander.
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High-test peroxide AI simulator
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High-test peroxide
High-test peroxide (HTP) is a highly concentrated (85 to 98%) solution of hydrogen peroxide, with the remainder consisting predominantly of water. In contact with a catalyst, it decomposes into a high-temperature mixture of steam and oxygen, with no remaining liquid water. It was used as a propellant of HTP rockets and torpedoes, and has been used for high-performance vernier engines.
Hydrogen peroxide works best as a propellant in extremely high concentrations, i.e., roughly, concentrations greater than 67%. Although any concentration of peroxide will generate some amount of oxygen and water in the form of hot gas, at such high concentrations, the heat of the decomposing hydrogen peroxide becomes high enough to completely vaporize any remaining liquid at ambient pressure. This represents an important safety and utilization threshold, as the decomposition of these high-concentration solutions above this is at risk of the liquid transforming entirely to heated gas: above this threshold, increasing concentration will release hotter gas. This high-temperature steam/oxygen mixture can be employed to generate thrust, power, or work, but is considered highly unstable, at risk of explosion in the presence of a strong initiating source, and a high hazard to health and safety.
Propellant-grade concentrations range from 70 to 99%, classified into four grades: of 71.0 to 73.0%, 85.0 to 87.0%, 89.5 to 91.0%, and 98.0-99.0%.
The volumetric change of peroxide due to freezing varies with percentage. Lower concentrations of peroxide (45% or less) will expand when frozen, while higher concentrations (65% or greater) will contract.
Hydrogen peroxide becomes more stable with higher peroxide content. For example, 98% hydrogen peroxide is more stable than 70% hydrogen peroxide. Water acts as a contaminant, and the higher the water concentration the less stable the peroxide is. The storability of peroxide is dependent on the surface-to-volume ratio of the materials the fluid is in contact with. To increase storability, the ratio should be minimized.
When used with a suitable catalyst, HTP can be used as a monopropellant, or with a separate fuel as a bipropellant.
HTP has been used safely and successfully in many applications, beginning with German usage during World War II, and continues to the present day. During World War II, high-test peroxide was used as an oxidizer in some German bipropellant rocket designs, such as the Walter HWK 509A rocket engine that powered the Messerschmitt Me 163 point defense interceptor fighter late in World War II, comprising 80% of the standardized mixture T-Stoff, and also in the German Type XVII submarine.
Some significant United States programs include the reaction control thrusters on the X-15 program, and the Bell Rocket Belt. The NASA Lunar Lander Research Vehicle used it for rocket thrust to simulate a lunar lander.