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

Summary Ocn@JOg  
It has been demonstrated that the performance of direct-fire kineticenergy AYfe_Dj  
ammunition improves significantly with increasing preignition =kCiJ8q|  
temperature (approximately 5% performance increase at 49 C above  vNdW.V}  
that demonstrated at ambient temperature for JA2). Existing launch ooP{Q r  
systems are designed to withstand pressures up to the level generated J25/Iy*byG  
by ammunition with a propellant temperature of 49 C, but are typically if3z Fh  
used at lower temperatures. This study simulated the effects of Ndyo)11z
 
heating the propellant bed of large-caliber ammunition to 49 C by ^(@]5
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microwave energy. When rapidly heated, propellant within a propellant U??OiKVZ+  
bed may not have sufficient time to thermally equilibrate. This px(~ZZB
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study investigated heating a typical propellant bed in two configurations: #r1y|)m`  
(1) through heating one-half of the axial length of the bed and a^ys7UV  
(2) radial heating into the bed along the entire axial length. A subscale .F[5{XV  
(7.6 cm diameter) simulator was used. Pressure-time histories from qT&zg@m  
several transducers placed along the wall of the simulator in the axial `tcX[(`  
direction were used to elucidate the flame spreading process. Baseline C~'.
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tests of the propellant bed were conducted at 30 C and at 49 C. O1+yOef"k  
Tests of propellant beds with reg .. Xq"Es  
kuq&; uk$Q  

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