IJE TRANSACTIONS A: Basics Vol. 28, No. 1 (January 2015) 121-129   

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B. Moosavi, A. A. Alemrajabi, A. Jafarian and M. Arablu
( Received: May 07, 2013 – Accepted: September 18, 2014 )

Abstract    Abstract During the last two decades, inertance tube pulse tube cryocoolers (ITPTC) applications in astronautics instruments gained momentum due to their high reliability. Moreover, significant efforts were made in order to improve ITPTCs operation. Investigations showed that most losses occur in the regenerator part. Due to complexity of physics of these losses, effects of the regenerator efficiency on the cryocooler performance were investigated in this work. For calculating heat transfer between solid matrix and acting fluid in the regenerator, Dual Energy Equation (DEE) model was used. Calculation of entropy flow inside the regenerator showed that almost 85% of the energy losses are due to viscous and inertial losses besides most of the energy losses occur in its hot end. Therefore in order to optimize the system, multi-mesh regenerator was studied. Results showed that under fixed CHX wall temperature of 150 (K), COP of the PTC with optimum multi-mesh regenerator, is 1.07 times higher than the value of uniform mesh regenerator ITPTC. A precise agreement was observed between simulation results and available experimental data published in the literature.


Keywords    Pulse tube cryocooler, Multi mesh regenerator, Oscillating flow


چکیده    چكيده طي دو دهه اخير، سردساز لوله ضرباني لوله اينرتنسي به دليل قابليت اعتماد بالا کاربرد بسيار وسيعي در صنايع هوا فضا يافته است. به همين جهت تلاش هاي زيادي جهت توسعه اين سيستم صورت گرفته است. بررسي ها نشان داده است که بيشترين تلفات اين سيستم در قسمت بازياب که محيطي متخلخل است صورت مي گيرد. بدليل پيچيدگي فيزيک اين تلفات، اثرات بازده بازياب بر عملکرد سردساز با استفاده از روش CFD مورد بررسي قرار گرفت. جهت محاسبه انتقال حرارت چابجايي در محيط بازياب از هر دو روش تک معادله اي و دو معادله اي بهره گرفته شد. محاسبه نرخ توليد انتروپي در محيط متخلخل بازياب نشان داد که 85% تلفات بازياب ناشي از تلفات ويسکوز و اينرسيال است و همچنين مقدار اين تلفات در انتهاي گرم بازياب اتفاق مي افتد. بنابراين، جهت بهبود عملکرد سردساز روش بازياب با مش چندگانه مورد مطالعه قرار گرفت. نتايج حاصل از شبيه سازي ها تحت شرايط دمايي 150 کلوين ديواره CHX مقدار ضريب عملکرد سردساز با بازياب با مش چندگانه بهينه 07/1 برابر سردساز ساده است. مقايسه نتايج شبيه سازي ها با مقادير آزمايشگاهي و مقادير عددي منتشر شده در نشريات درستي نتايج شبيه سازي حاضر را تاييد کرد.


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