Hossein Mahdavy-Moghaddam; mohammad hadi Hamedi
Volume 10, Issue 2 , September 2017, , Pages 23-32
Abstract
Recently, a novel technique using dual throat nozzles is introduced for thrustvectoring applications. The present paper discusses this new technique. All thrustvectoring techniques are evaluated with some common parameters: nozzle dischargecoefficient, system thrust ratio, thrust vector angle and thrust ...
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Recently, a novel technique using dual throat nozzles is introduced for thrustvectoring applications. The present paper discusses this new technique. All thrustvectoring techniques are evaluated with some common parameters: nozzle dischargecoefficient, system thrust ratio, thrust vector angle and thrust vectoring efficiency. For agiven micro turbine nozzle geometry, a double throat nozzle is designed usingdimensional scaling or geometrical analogy. Then, by comparing the results obtainedfrom a designed geometry for discharge coefficient, thrust vector angle and thrust vectorefficiency, the DTN performance is reported. The designed DTN deflected the vectorangle of 18 degrees with the fluidic injection flow rate equal to 10 percent of the primaryflow rate.
H. Mahdavy Moghaddam; M. M. Javadi
Volume 5, Issue 2 , July 2012, , Pages 75-83
Abstract
Outer space ballistic missiles use thrust vector control system and it is because aerodynamic surfaces are not efficient in thin air.Flexible joint is the most useful type of thrust vector control system through satellite transporters and ballistic missiles based on solid fuel. Most common type of elastomer ...
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Outer space ballistic missiles use thrust vector control system and it is because aerodynamic surfaces are not efficient in thin air.Flexible joint is the most useful type of thrust vector control system through satellite transporters and ballistic missiles based on solid fuel. Most common type of elastomer in these structures is rubbers and especially natural rubber, which require special preparation and cure processes. The goal defined in this article is to introduce a process which is much easier to apply. Based on flexible joint design in Japanese MV booster missile, an elastomer based on polyurethane resin, which is easily applicable and consists of two liquid parts, is used instead of original Polyisoperne. This elastomer has achieved a good rank in both sealing test in eight-bar pressure and hydrostatic test in the pressure of 70 bars. It also has been fire tested and the results were satisfactory.
