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Subject:
super sonic JDAM
Professor Fickle
6/16/2008 7:33:50 PM
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Internal weapon bay could not deliver a JDAM at super sonic speed until this came along. We will see it on the F-35 hopefully.
>www.gizmag.com/boeing-active-flow-technology/8422/
link
Active flow control technology allows Boeing to deploy munitions at Mach 2
November 28, 2007 In a landmark demonstration, Boeing and the U.S. Air Force have used "active flow control" technology to deploy munitions from a weapons bay at twice the speed of soun link . The MK-82 Joint Direct Attack Munition Standard Test Vehicle was released from a rocket sled at the High-Speed Test Trac link at Holloman Air Force Base, New Mexico, representing the first safe release of munitions from a weapons bay at high supersonicGreen-Speed-At-Bonneville speeds.
Active flow control technology involves placing a tandem array of microjets upstream of the weapons bay, which reduces the unsteady pressures inside the bay and modifies the flow outside to ensure the test vehicle travels out of the rocket sled correctly. "Active flow control technology will enable safe separation of weapons from weapons bays of future high speed aircraft," said Jim Grove, AFRL program manager for High Frequency Excitation Active Flow Control for Supersonic Weapon Release, or HIFEX. "This program also demonstrates that sled testing can provide a lower risk technology evaluation alternative to flight testing in this complex, high risk environment."
Wind tunnel testing indicated that without active flow control, the JDAM test vehicle would have returned to the bay. The release of the test vehicle from the rocket sled bay was a bigger challenge than an equivalent release from an aircraft bay at altitude, due to the reduced dynamic pressure, reduced vibration and increased amount of time in which to release a store enjoyed by the latter
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