Fokozott fajlagos teljesítményű axiális átömlésű forgógépek többcélú optimalizálása = Multi-Objective Optimisation of Axial Flow Turbomachinery of High Specific Performance

1) Axialis atomlesű ventilatorok „szabalyzott orveny” tervezesere valamint a lapatnyilazas/lapatferdites alkalmazasara vonatkozo uj megallapitasok es mernoki tampontok, amelyek hozzajarulnak a lapattervezeshez, előirt fokozott legtechnikai teljesitmeny maximalis hatasfokon tortenő megvalositasa erdekeben. A legfontosabb tampontok: - A sugar menti lapatcirkulacio-gradiens es a csatornafali hatarreteg kiszorito hatasa kozti osszefugges. Az előrenyilazas reven a radialis kiaramlas es igy a kiszorito hatas mersekelhető. - A lapat szivott oldali hatarretegeben a radialis iranyu kiaramlas fokozodik, fokozva a gyűrűfalaktol tavolabb a lapat menti folyadekpalyak hosszat es igy a falsurlodas hatasfeluletet, ezaltal eselyt adva az ossznyomas-veszteseg fokozodasara. E kedvezőtlen hatas szinten a lapatozas előrenyilazasaval mersekelhető. -Az előrenyilazas/előreferdites hatasara adott terfogataramon modosul a teljes lapatmagassag menten a raaramlas axialis sebessegprofilja es igy a megfuvas szoge. Ezt a hatast figyelembe kell venni a lapatozas tervezesekor. 2) Olyan osszetett numerikus aramlastani es numerikus akusztikai modszertan meghonositasa – tavlatilag integralva a nagy orveny szimulacio technikat is –, mely a fenti tervezesi tampontokat a lapatozas előtervezesi fazisa utan figyelembe tudja venni, megalapozva az axialis forgogepek CFD alapu iterativ „szabalyzott orveny” tervezeset, a legtechnika, energetikai es akusztikai celok egyuttes elerese erdekeben. | 1) Novel establishments and engineering guidelines related to controlled vortex design (CVD) and blade sweep/skew applied to axial flow fans, contributing to blade design, in order to realize prescribed aerodynamic performance at maximum efficiency. The most important guidelines are as follows: - Relationship between CVD spanwise blade circulation gradient and endwall blockage. By means of forward blade sweep, the radial outward flow, and thus, the near-tip blockage can be moderated. - Due to CVD, the radial outward flow is intensified in the blade suction side boundary layer, elongating the flow paths, thus increasing the effect of wall skin friction, leading to increase of total pressure loss. This unfavourable effect can be moderated also by means of forward sweep. - Due to forward sweep/skew, the inlet axial velocity profile, and thus, the incidence angle is modified along the entire span at prescribed flow rate. This effect is to be considered in blade design. 2) Domestication of a complex computational fluid dynamics (CFD) and computational aero-acoustics methodology – integrating the Large Eddy Simulation technique as a long-term investment –, for consideration of the above guidelines after the preliminary blade design phase, establishing the CFD-based iterative design of axial flow turbomachines of CVD, for simultaneous achievement of aerodynamic, energetic and acoustic goals.