 prospect magneto-aerodynam prospect magneto-aerodynam equat describ flow electr conduct fluid presenc electr magnet field written aid simplif appropri aeronaut applic order estim probabl signific magneto-aerodynam effect data conduct pure seed air examin dimensionless quantiti repres ratio forc current form valu studi condit flight atmospher exampl magneto-hydrodynam magneto- gasdynam effect simpl flow includ case poiscuil flow conduct liquid appli magnet field case quasi-on-dimension ga flow appli electr magnet field case attract possibl control acceler deceler ga subson superson speed constant-area channel behavior flow characterist regim mach number flow speed rel speed depend ratio electr magnet field strength studi chart construct relat length speed ratio maximum-acceler constant-area channel conclud advantag accru magneto-aerodynam method attract justifi consider engin develop requir unsolv engin problem reduct surfac resist electrod contact conduct ga develop techniqu seed provis requir magnet field flight 