"8"^^ . . "Increasing the efficiency of the ducted fan for small aircraft"@en . . . . "2014-07-01+02:00"^^ . . . "http://www.isvav.cz/projectDetail.do?rowId=TA04031817"^^ . "0"^^ . "The goal of the project is to increase the efficiency of the innovative propulsive unit for small airplanes. The innovation of the propulsive unit that is currently beeing developed is in replacing the standard propeller with a fan stage installed in an air duct inside the fuselage of the airplane. The complete propulsive unit consists of an inlet channel, fan stage with a stator stage and a piston engine run by a rotor, outlet channel with a cooling by-pass and a nozzle. Because of the subsonic flow inside the propulsive unit it is impossible to design individual parts of such a complex device independently, it is necessary to use the iterative algorithms, which will take them into consideration. In spite of the detailed development, only after the extented development and functional experiments on the real device and in real operating conditions (e.g. test of the propulsive unit in a real fuselage in a wind tunnel) it was possible to evaluate the efficiency of the set and define activities to increase the efficiency. The goal of the project, based on the experience gained in tests of the functional sample, is to increase the efficiency of the individual parts of the propulsive unit and the total efficiency in order to maximally shorten the time between the test flights of the prototype and the repeated production of the aiplane. It is especially: - optimization of the inlet channel in order to obtain maximum uniformity of the flow field in front of the fan stage, minimize losses in the total pressure and minimize drag of the airplane - design of the blading geometry respecting the influence of the flow field at the output from the inlet channel, the pressure loss in the back of the fan and the real parameters of the drive unit - test the applicability of the drive unit with better installement parameters and higher reliability - optimize the shape of te outlet channel, especially the shape of the cooling by-pass, in order to better use the waste heat"@en . . "TA04031817" . "Zv\u00FD\u0161en\u00ED \u00FA\u010Dinnosti ventil\u00E1torov\u00E9ho pohonu mal\u00E9ho letounu" . . . "1"^^ . . "2016-12-31+01:00"^^ . "2"^^ . . . . "2015-05-05+02:00"^^ . "2014-10-31+01:00"^^ . "propulsion unit- fan stage- inlet channel- outlet channel- efficiency"@en . . . . . . "V\u00FDsledn\u00FDm c\u00EDlem projektu je celkov\u00E9 zv\u00FD\u0161en\u00ED \u00FA\u010Dinnosti inovativn\u00ED pohonn\u00E9 jednotky pro mal\u00E9 letouny. Inovativnost v sou\u010Dasnosti vyv\u00EDjen\u00E9 pohonn\u00E9 jednotky spo\u010D\u00EDv\u00E1 zjednodu\u0161en\u011B \u0159e\u010Deno v nahrazen\u00ED standardn\u00ED vrtule ventil\u00E1torov\u00FDm stupn\u011Bm ulo\u017Een\u00FDm v proudovodu uvnit\u0159 trupu letounu. Kompletn\u00ED propulzor tedy sest\u00E1v\u00E1 ze vstupn\u00EDho kan\u00E1lu, ventil\u00E1torov\u00E9ho stupn\u011B tvo\u0159en\u00E9ho p\u0159edstatorem a p\u00EDstov\u00FDm motorem poh\u00E1n\u011Bn\u00FDm rotorem, v\u00FDstupn\u00EDho kan\u00E1lu s chladic\u00EDm obtokem a trysky. Vzhledem k podzvukov\u00E9mu proud\u011Bn\u00ED uvnit\u0159 cel\u00E9ho propulzoru nen\u00ED mo\u017Eno jednotliv\u00E9 \u010D\u00E1sti takto komplexn\u00EDho za\u0159\u00EDzen\u00ED navrhovat izolovan\u011B, mus\u00ED se pou\u017E\u00EDt itera\u010Dn\u00ED algoritmy, kter\u00E9 postihnou vz\u00E1jemn\u00E9 interakce. P\u0159es velice d\u016Fsledn\u00FD teoretick\u00FD i experiment\u00E1ln\u00ED v\u00FDvoj, kter\u00FD p\u0159edch\u00E1zel stavb\u011B funk\u010Dn\u00EDho vzorku trupu letounu s pohonnou jednotkou, teprve po rozs\u00E1hl\u00FDch v\u00FDvojov\u00FDch a funk\u010Dn\u00EDch zkou\u0161k\u00E1ch na re\u00E1ln\u00E9m d\u00EDle v podm\u00EDnk\u00E1ch simuluj\u00EDc\u00EDch skute\u010Dn\u00E9 provozn\u00ED podm\u00EDnky (nap\u0159. zkou\u0161ky pohonu v re\u00E1ln\u00E9m trupu v aerodynamick\u00E9m tunelu) bylo mo\u017Eno vyhodnotit \u00FA\u010Dinnost cel\u00E9ho soustroj\u00ED a definovat aktivity vedouc\u00ED k jej\u00EDmu zv\u00FD\u0161en\u00ED. C\u00EDlem projektu je na z\u00E1klad\u011B zku\u0161enost\u00ED z\u00EDskan\u00FDch zkou\u0161kami funk\u010Dn\u00EDho vzorku zv\u00FD\u0161it \u00FA\u010Dinnosti jednotliv\u00FDch \u010D\u00E1st\u00ED propulzoru a t\u00EDm jeho celkovou \u00FA\u010Dinnost tak, aby se maxim\u00E1ln\u011B zkr\u00E1tila doba mezi z\u00E1letem prototypu a opakovanou v\u00FDrobou letounu. Jedn\u00E1 se zejm\u00E9na o: - optimalizaci tvaru vstupn\u00EDho kan\u00E1lu s ohledem na z\u00EDsk\u00E1n\u00ED maxim\u00E1ln\u00ED rovnom\u011Brnosti proudov\u00E9ho pole p\u0159ed ventil\u00E1torov\u00FDm stupn\u011Bm, minimalizaci ztr\u00E1t celkov\u00E9ho tlaku a minimalizaci odporu letounu - n\u00E1vrh geometrie lopatkov\u00E1n\u00ED ventil\u00E1torov\u00E9ho stupn\u011B respektuj\u00EDc\u00ED vliv proudov\u00E9ho pole na v\u00FDstupu ze vstupn\u00EDho kan\u00E1lu, tlakov\u00E9 ztr\u00E1ty za ventil\u00E1torem a re\u00E1ln\u00E9 parametry hnac\u00EDho agreg\u00E1tu - ov\u011B\u0159en\u00ED pou\u017Eitelnosti hnac\u00EDho agreg\u00E1tu s v\u00FDhodn\u011Bj\u0161\u00EDmi z\u00E1stavbov\u00FDmi parametry a vy\u0161\u0161\u00ED potenci\u00E1ln\u00ED spolehlivost\u00ED - optimalizaci tvaru v\u00FDstupn\u00EDho kan\u00E1lu, zejm\u00E9na tvaru chladic\u00EDho obtoku, pro lep\u0161\u00ED vyu\u017Eit\u00ED odpadn\u00EDho tepla" . "8"^^ . .