[仿真]Impact of Partial Heating of Solid Propellant as Elucidated by Simulation of Microwave Heating

Summary g
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It has been demonstrated that the performance of direct-fire kineticenergy ]ZP!y  
ammunition improves significantly with increasing preignition FSz<R*2  
temperature (approximately 5% performance increase at 49 C above -da: j-_  
that demonstrated at ambient temperature for JA2). Existing launch _u;pD-  
systems are designed to withstand pressures up to the level generated #Muh|P]%\  
by ammunition with a propellant temperature of 49 C, but are typically 3.P7GbN  
used at lower temperatures. This study simulated the effects of vgDpo@fz8  
heating the propellant bed of large-caliber ammunition to 49 C by Wt@hST  
microwave energy. When rapidly heated, propellant within a propellant F/1m&1t  
bed may not have sufficient time to thermally equilibrate. This /kw;q{>?o  
study investigated heating a typical propellant bed in two configurations: ~xDu2-5  
(1) through heating one-half of the axial length of the bed and XM"Qs.E  
(2) radial heating into the bed along the entire axial length. A subscale AEx VKy  
(7.6 cm diameter) simulator was used. Pressure-time histories from 0Ntvd7"`}  
several transducers placed along the wall of the simulator in the axial \ntUxPox.  
direction were used to elucidate the flame spreading process. Baseline ,B_tA
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tests of the propellant bed were conducted at 30 C and at 49 C. X!ldL|Ua%  
Tests of propellant beds with reg .. h-O;5.m-P  
@vib54G  

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