机械工程学报
機械工程學報
궤계공정학보
Journal of Mechanical Engineering
2015年
20期
201-207
,共7页
刘兴旺%张官正%李超%赵嫚
劉興旺%張官正%李超%趙嫚
류흥왕%장관정%리초%조만
涡旋压缩机%径向迷宫密封%透气流%泊肃叶流%泄漏量
渦鏇壓縮機%徑嚮迷宮密封%透氣流%泊肅葉流%洩漏量
와선압축궤%경향미궁밀봉%투기류%박숙협류%설루량
scroll compressor%radial labyrinth%ventilation flow%Poiseuille flow%leakage
以涡旋压缩机径向迷宫密封为研究对象,分别用宏观能量法和黏性流动理论计算该密封的泄漏量,通过泄漏量理论值与实测值的对比,以期探寻泄漏气体的气动热力行为。在假设无透气效应和泄漏气体在迷宫槽中作等压恒温恢复的条件下,建立求解泄漏量的数理方程;在考虑透气效应与非等压恒温恢复的条件下,利用热力过程方程与黏性流动理论推导出透气流是否达到声速的判别式及临界气速、临界密度、泄漏量的计算式。将两种算法所得泄漏量与实测泄漏量对比研究发现,直通型迷宫密封中气体泄漏过程是膨胀吸热过程,膨胀过程指数随相邻压缩腔压差的增大而减小;泄漏是由透气流与相邻迷宫槽间的二维泊肃叶流共同作用形成的,透气效应随相邻压缩腔压差的增大而更加明显;用黏性流动理论求解泄漏量具有较高的计算精度。
以渦鏇壓縮機徑嚮迷宮密封為研究對象,分彆用宏觀能量法和黏性流動理論計算該密封的洩漏量,通過洩漏量理論值與實測值的對比,以期探尋洩漏氣體的氣動熱力行為。在假設無透氣效應和洩漏氣體在迷宮槽中作等壓恆溫恢複的條件下,建立求解洩漏量的數理方程;在攷慮透氣效應與非等壓恆溫恢複的條件下,利用熱力過程方程與黏性流動理論推導齣透氣流是否達到聲速的判彆式及臨界氣速、臨界密度、洩漏量的計算式。將兩種算法所得洩漏量與實測洩漏量對比研究髮現,直通型迷宮密封中氣體洩漏過程是膨脹吸熱過程,膨脹過程指數隨相鄰壓縮腔壓差的增大而減小;洩漏是由透氣流與相鄰迷宮槽間的二維泊肅葉流共同作用形成的,透氣效應隨相鄰壓縮腔壓差的增大而更加明顯;用黏性流動理論求解洩漏量具有較高的計算精度。
이와선압축궤경향미궁밀봉위연구대상,분별용굉관능량법화점성류동이론계산해밀봉적설루량,통과설루량이론치여실측치적대비,이기탐심설루기체적기동열역행위。재가설무투기효응화설루기체재미궁조중작등압항온회복적조건하,건립구해설루량적수리방정;재고필투기효응여비등압항온회복적조건하,이용열력과정방정여점성류동이론추도출투기류시부체도성속적판별식급림계기속、림계밀도、설루량적계산식。장량충산법소득설루량여실측설루량대비연구발현,직통형미궁밀봉중기체설루과정시팽창흡열과정,팽창과정지수수상린압축강압차적증대이감소;설루시유투기류여상린미궁조간적이유박숙협류공동작용형성적,투기효응수상린압축강압차적증대이경가명현;용점성류동이론구해설루량구유교고적계산정도。
The scroll compressor’s radial labyrinth sealing is regarded as the research object, by using the macro energy method and the theory of viscous flow, the leakage for the sealing structure are calculated, to find aerodynamic and thermodynamic behavior of gas leakage. A comparison is made between experimental results and theoretical predictions. Assuming that there is no ventilation effect and the gas do isobaric and isothermal recovery in the labyrinth groove, the mathematical equation of leakage is established; while considering the ventilation effect and non isobaric isothermal recovery, by using thermodynamic equation and the theory of viscous flow, discriminant for judging whether ventilation flow comes up to speed of sound is deduced, and the algorithm to calculate critical velocity, critical density and leakage is proposed. The different between experimental results and theoretical predictions of leakage is analyzed. The result indicates that leakage process in straight through labyrinth sealing is expansion process accompanied with absorption of heat. The thermodynamics index decrease obviously with the increase of the pressure differences of two adjoining pressure chamber, and the leakages is composed of ventilation flow and 2D Poiseuille between in adjoining labyrinth groove, ventilation effect become also clearer with the increase of the pressure differences. The algorithm with theory of viscous flow for leakage has high computational precision.