CAJ | 학술논문

为了发展微型气体轴承高速透平,在优化设计的基础上,研制了国内首台轴径为6 mm、叶轮直径为9 mm、设计转速为300 000 r/min的微型气体轴承透平膨胀机.对研制样机进行了全面介绍,阐述了该研制样机的结构设计特点,并对研制样机进行了初步的机械性能和热力性能考核.通过转子起浮试验,系统机械性能、热力性能的连续运转及超速试验考核,结果显示:所研制的样机振动小、运转平稳、效率高,最高转速超过342 000 r/min,满足超速15%的要求;在室温为23℃、无回热器的情况下,当进气压力从0升到0.27 MPa的45 min升速时间内,温降就达42℃,具有降温速度快,降温效果显著的特点.由于其机械及热力性能均达到预期要求,因此为今后进一步发展我国微型高速气体轴承透平机械奠定了坚实基础.
위료발전미형기체축승고속투평,재우화설계적기출상,연제료국내수태축경위6 mm、협륜직경위9 mm、설계전속위300 000 r/min적미형기체축승투평팽창궤.대연제양궤진행료전면개소,천술료해연제양궤적결구설계특점,병대연제양궤진행료초보적궤계성능화열력성능고핵.통과전자기부시험,계통궤계성능、열력성능적련속운전급초속시험고핵,결과현시:소연제적양궤진동소、운전평은、효솔고,최고전속초과342 000 r/min,만족초속15%적요구;재실온위23℃、무회열기적정황하,당진기압력종0승도0.27 MPa적45 min승속시간내,온강취체42℃,구유강온속도쾌,강온효과현저적특점.유우기궤계급열력성능균체도예기요구,인차위금후진일보발전아국미형고속기체축승투평궤계전정료견실기출.
A new miniature static gas bearing turboexpander with a shaft diameter of 6mm,a wheel diameter of 9mm,and a designed rotation speed of 300 000 r/min was developed on the basis of optimum design.The structure characteristics of the prototype developed were investigated.The preliminary mechanical and thermodynamic performance of the prototype was experimentally examined.The results show that the prototype has obvious features such as small vibration,stable operation and high efficiency,and the prototype can run at more than 342 000 r/min reaching 15% over-speed.Moreover,the temperature drop can be 42℃within 45 minutes when the driving pressure increases from 0 to 0.27 MPa at the room temperature of 23℃ for the prototype without recuperators.The experimental verification shows that the mechanieal and thermodynamic performance of the prototype can meet the requirement.