LE-5
LE-5 is the rocket engine which National Space Development Agency (NASDA, existing Japan Aerospace Exploration Agency JAXA) developed with National Aerospace Laboratories, Japan (NAL) and Mitsubishi Heavy Industries (MHI), Ishikawajima-Harima Heavy Industries (existing IHI).
Table of contents
Summary
It is the first among Japan for the practical use rocket engine which assumed liquid oxygen (LOX) and liquid hydrogen (LH2) a propellent. Development was begun in 1975 as an engine for the second step of the H-I rocket (in the beginning of development start an N improvement type type 2 rocket). As for the production of equipment of a ship and the burner, IHI was in charge of the production of MHI, turbopump and the gas generator each.
In development, I fed back result of 7 tons grade LOX/LH2 engine ES-702[1] and 10 tons grade LOX/LH2 engine ES-1001 of Tokyo University Institute of Space and Aeronautical Science (Institute of Space and Astronautical Science (ISAS) in the back) which preceded NASDA and NAL in fundamental researches at a component level and was going to use 10 tons grade engine as backup when I failed in development of LE-5 [2].
It was designed in consideration of re-firing on the orbit and succeeded in re-firing in the use of the H-I rocket for the first time in orbit. The ability for re-firing is succeeded afterward in LE-5A and is enabled to 再々着火 in LE-5B. To LE-5A, I was not able to perform the slot ring (thrust adjustment) of the thrust, but there came to be 3% of slot rings which did not let 60%, 30%, a turbine drive from LE-5B [3].
Structure
I adopt a gas generator cycle for the combustion cycle of the engine and drive turbopump by a gas generator using the low temperature combustion gases that hydrogen of air-fuel ratio 0.9 that I produced is rich and up-convert fuel. The combustion gases used for drive are exhausted from the lower nozzle. I work in クーラントブリードサイクル without using the starters such as a turbine spinner or the high pressure start tank at the time of the start unlike an engine for a conventional gas generator cycle. This is a reliable start method adopted for the first time in the world in LE-5 [4]. After the start of the thrust after the start was confirmed, the change to a gas generator cycle is carried out.
The combustion chamber displays a lot of taper nickel pipes and gold is the pipe structure burner which I brazed and cools reproduction by draining liquid hydrogen in a cooling jacket comprised of a nickel pipe [5]. In addition, I secure pressure tightness by reinforcing the outside with a metal plate.
Main specifications
| LE-5 | LE-5A | LE-5B | |
|---|---|---|---|
| Combustion cycle | Gas generator cycle | エキスパンダブリードサイクル (nozzle expander) | エキスパンダブリードサイクル (chamber expander) |
| Thrust kN during the vacuum | 102.9 (10.5 tf) | 121.5 (12.4 tf) | 137.2 (14 tf) |
| Air-fuel ratio | 5.5 | 5 | 5 |
| The expansion ratio | 140 | 130 | 110 |
| Specific impulse s during the vacuum | 450 | 452 | 447 |
| Combustion pressure MPa | 3.65 | 3.98 | 3.58 |
| LH2 turbopump number of revolutions min-1 | 50,000 | 51,000 | 52,000 |
| LOX turbopump number of revolutions min-1 | 16,000 | 17,000 | 18,000 |
| Full length m | 2.68 | 2.69 | 2.79 |
| Mass kg | 255 | 248 | 285 |
Remarks
Percussion of the purchase was in 1,986 years from McDonnell Douglas Corp., but the export contract in LE-5 was not established, and the negotiations shifted to LE-5A where development had been already started.
Source
- ^ Japan Aerospace Exploration Agency Institute of Space and Astronautical Science report. Development - Nobuhiro Tanatsugu, 成尾芳博, Hideo Maruta, Ryojiro Akiba, Kenji Kuratani of the special feature 6 liquid water / liquid acid stage
- Development - Nobuhiro Tanatsugu, 成尾芳博, Kenji Kuratani, Ryojiro Akiba, Akira Iwama of the memoir liquid water / liquid acid engine of the ^ Institute of Space and Astronautical Science report special feature sixth liquid water / liquid acid engine
- ^ 三菱重工技報 Vol.48 No. 4
- The development of ^ Japan mechanics party magazine Vol. 90 822nd (2) liquid acid, the liquid water rocket engine (LE-5): Technical prize - Eiji Sogame, Toshihiko Fujita, Ken Kamijo Jiro, Takeshi Fujimura light Akira Okayasu
- Rocket engine - Tomifumi Godai of ^ Japan Society of Mechanical Engineers these days
Allied item
Outside link
This article is taken from the Japanese Wikipedia LE-5
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