EXPERIMENTAL STUDY ON COMPOSITE SOLID PROPELLANT MATERIAL BURNING RATE USING MATLAB ALGORITHM
In rock etry ap pli ca tion, now a days in stead of monopropellants slowly com pos ite pro pel lants are in tro duced. Burn ing rate of a solid state com pos ite pro pel lant de pends on many fac tors like ox i dizer binder ra tio, ox i dizer par ti cle size and dis tri bu tion, par ti cle size and its dis tri bu tion, pres sure, tem per a ture, etc. Sev eral re search ers had taken the mass var ied com pos ite pro pel lant. In that, the am mo nium perchlorate mainly var ied from 85 to 90% This pa per deals with the ox i dizer rich pro pel lant by al low ing small vari a tion of fuel cum binder rang ing from 2% 4% 6% and 8% by mass. Since the per cent of the binder is very less com pared to the ox i dizer, the mix ture re mains in a pow der form. The pow der sam ples are used to make a pressed pel let. Experiments were con ducted in closed win dow bomb set up at pres sures of 2, 3.5, and 7 MN/m. The burn ing rates are cal cu lated from the com bus tion pho tog ra phy (im ages) taken by a high speed cam era. These im ages were pro cessed frame by frame in MATLAB, de tect ing the edges in the im ages of the frames. The burn ing rate is ob tained as the slope of the lin ear fit from MATLAB and ob served that the burn rate in creases with the mass vari a tion of con stit u ents pres ent in solid state com pos ite pro pel lant. The re sult in di cates a re mark able in crease in burn rate of 26.66% 20% 16.66% and 3.33% for Mix 1, 2, 3, 4 com pared with Mix 5 at 7 MN/m. The per cent age vari a tions in burn rate be tween Mix 1 and Mix 5 at 2, 3.5, and 7 MN/m are 25.833% 32.322% and 26.185% re spec tively.