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The present work is carried out to reduce the leaka ge through the labyrinth seal by optimizing the tooth profile and operating clearances. The effects of pressure ratio, clearance, to oth width and height, and number of throttles upon the leakage through a straight-through labyrinth se al for incompressible flow were experimentally investigated. Measurements in a developed test sect ion over wide geometric factors and flow conditions were carried out. The experimental results indicated that the pre ssure ratio had significant effect on the flow coefficient. The flow coefficient decreased with in creasing the pressure ratio. As the clearance increased the flow coefficient increased. However, the flow coefficient was increased as the clearance, became very small. The flow coefficient reached a maximum value at tooth width to clearance ratio of 2. The effect of tooth height on the flow coefficient was found negligible for tooth height to clearance ratio higher than 2. The flow coefficient decreased as the number of throttles increased, then attained constant value w h n the number of throttles became larger than seven. The observed trends of the results for incom pressible fluid through straight-through labyrinth seals can be used to establish some gener al g ometric constraints for minimizing the leakage. لدعلا ثنرب لا عنامل لثم ا صولخلاو لكشلا داجي ةيبيرجت ةسارد لوانت ثحبلا اذھ . نم لك ريثأت ةساردلا تلوانت ا$ھتوطخو ا$ھعافتراو ةنس$لا ضر$ع ، نان$س+ا دد$ع ، صولخلا ، جرخملا دنع طغضلا ىلا لخدملا دنع طغضلا ةبسن فرصتلا لماعم ىلع . برا$جتلا ت$يرجأ ني$ب حوار$تت ة$فلتخم مي$ق د$نع 0.2 mm ى$تح 1.5 mm ، صو$لخلل 1.5 mm ىتح 18 mm ، ةنسلا ضرعل 1.2 mm ىتح 15 mm امھراد$قم نيتو$طخو ةنسلا عافتر+ 10 mm ، 20 mm ني$ب حوار$تت ة$فلتخم طوغ$ض بس$نو 0.1 ى$تح 0.9 . ع$م ل$قي فرص$تلا ل$ماعم نا تح$ضوأ برا$جتلا جئا$تن ا ىلا صولخلا ةميق ضافخنا نم برقت ةميق ىلا صولخلا ضافخنا عم ىرخا ةرم دادزي مث هل ةميق ىندأ ىلا لصي ن رفصلا . ى$لا لص$يو ةنس$لا ضر$عل ةريغص$لا مي$قلل ريبك لدعمب دادزي فرصتلا لماعم نا اضيا براجتلا جئانتن تنيب ن$س?ل ابيرقت ةتباث ةميق ىلا لصي ىتح ةنسلا ضرع ةدايز عم ايجيردت لقي مث هل ةميق ىصقا ر$يبكلا ضر$علا تاذ نا . راد$قم ى$لا ةنس$لا عا$فترا بس$ن مي$قل ك$لذو فرص$تلا ل$ماعم ىلع سوملم ريثأت ةل سيل ةنسلا عافترا نا جئاتنلا تتبثأ نم ربكأ عناملل صولخلا 2.0 . دد$ع ى$تح فرص$تلا ل$ماعم ن$م ل$لقي ثنرب لا نانسأ ددع ةدايز نا جئاتنلا ترھظأ نع اھتدايز ناو ةعبس ةرادقم نانسا فرص$تلا ل$ماعم ى$لع رثؤي + ددعلا ادھ . نير$خا نيثحا$ب ع$م جئا$تنلا ة$نراقم م$ت امھنيب قفاوت دجوو . ذ$خ ا ع$م ن$كما ا$م ل$ك صولخلا ليلقت ةلدعلا ثنرب لا عناوم ميمصت دنع بجي ثحبلا جئاتن نم $لا ةو$طخ فص$ن ا$بيرقت ىواس$يو اريغ$ص نو$كي نا ب$جي ةنس$لا ضر$ع ، ىرار$حلا ددمتلا رابتع+ا ىف عا$فترا ، ةنس صولخلا ةميق فعض نع لقي + ةنسلا .

EXPERIMENTAL INVESTIGATION OF AN INCOMPRESSIBLE FLOW IN A LABYRINTH SEALS