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We discuss the modeling of heterogeneous propellant morphology using a random-pack algorithm, and show that realistic fractions of ammonium perchlorate (AP) can be packed, with realistic particle-size distributions. Propellants defined in this way can be used as the foundation for numerical calculations of burning propellants, and a model which accounts for gas-phase combustion, solid-phase heat conduction, and the unsteady nonuniform regression of the surface, is described. Periodic sandwich propellants are a convenient platform on which to generate the numerical code, and we give some indication of the nature of the solutions in this case. In addition we present some preliminary results for the burning of periodic squares of randomly packed AP discs, which support a 2D combustion field. Kinetic data are determined by fitting to ID experimental data (pure AP, fine AP/binder blend), and in doing this known instabilities are uncovered and we provide some new discussion of this topic 1 .

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1st ;illcs zugtvgclwii, so erhitxt ni:tii noc.11 h o lange, his kein hTitroiiiet1i:iii init tlcn W:tsxertlaiiil)feii iiielir iibergelit, i i i i t l tlehtilliert tlaiin noth ct\va 950 cciii 1V':ts-er all (.\o laiige aiiitl noch iiic~i.klic~lie 3Iengcn Nitromethan tlariii gtx16at), ciitfwnt iiiiii (lurch Abiaiigen ails deiii Rcnktioiisko1l)cn (lie Fliissigkcit his :iaf ct\\-n 1UO c t w , crtiitzt \vitder ziiiii Sictlrii iuitl l&Bt die iiizwisclicn d i i i~~~l i Neutralisicreii roii weitvrcii 500 g 'Iiloi,,.~..ig-aiii.~~ i r i i d Zlifiigt>ii yon N:itriiiiiiiiitrit Iir:rgestc~lltc Ktsaktioiisliihung in gleic1ir.i. \Vcise \vie ~o r l i c r zuflicl3en. J h r c l i Wirdt~rholiiiig :lieher Vorgange k:inn iiisn olint~ Untcrlwecliung I)elii.l)ige hlengen Chlore~sig..bri:c in Nitroiiittlinn iilrerfiihren.Dns so gc\voiiiime Nitroiiietlian, (la.; schoii i n rolicni Ziistsiitl fnst rollig f;trl)los ist, fiiigt iiiaii sofort i i l w r,t\\-:is (Ihlort*alt*iuiii nuf. Dic niit t l c i i i Kitroincthan iilwrgcheiit~eii Wiisst~ wvcrtkii iiiit I(od1salz geskttigt (auf l(.)O cciii l.'lussigkcit 3) -% g) uiitl i i i eiiier analogen Apparatur, 1x3 tier jetloch tler I)cstill:itionskollren iinr v i i i Liter xu fnssen I,rauclit und tles Twpftriditers so\vie des Al)lal3rohres entIiehi.tw Itanti, sofort wietler zu etiva al)de..tilliert . uiitl tler ProzeB iiiit tlen tl;il)ei eiitstelientlen 1)r~tillntioii~wPsserii iiot.liiii:ils \vicderholt. hfaii erliilt ht3 \veitcrc Meiig.cn Pl'itronietliaii. Die lieiiiigiiiig crfolgt \vie friiher tlurcli ~cstillntioii iillei. \\-euig Quwksillierosytl. Aux1)ciitc Iretragt 300,',, (lei. Theorie. Man ksiiii crliiie Sc.hwierigkeit aii eiiieni Tnge 2 kg untl iiielii. Cli1oressigsiui.e verc:rl)eiteii.