طراحی پمپ جریان مختلط و تحلیل عددی و پارامتری آن با استفاده از دینامیک سیالات محاسباتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد ،دانشگاه صنعتی مالک اشتر، تهران، ایران

2 دانشیار، دانشگاه صنعتی مالک اشتر، تهران، ایران

3 استادیار، دانشگاه صنعتی مالک اشتر، تهران، ایران

چکیده

 پمپ‌های جریان مختلط دارای کاربرد وسیع، راندمان بالا و دامنه گسترده تغییرات هد هستند. یکی از مسائل پر اهمیت در پمپ‌های جریان مختلط عملکرد در حالت گذرا است. باتوجه ‌به پیچیده بودن هندسه پمپ جریان مختلط و پیچیدگی در شبیه‌سازی، به‌خصوص در حالت گذرا، کم‌تر به تحلیل جریان گذرا در پمپ جریان مختلط پرداخته شده است. در این مقاله یک پمپ جریان مختلط با استفاده از نرم‌افزار CFturbo طراحی و در طی فرایند پایا و گذرا با استفاده از نرم‌افزار CFX تحلیل شد. برای اطمینان از صحت نتایج عددی، یک اعتبارسنجی انجام شد که نتایج عددی انطباق خوبی با نتایج آزمایشگاهی داشتند. دو مطالعه پارامتریک شامل، بررسی اثر تغییر زاویه خروجی پره در چهار زاویه متفاوت در حالت پایا و دو زاویه در حالت گذرا و اثر تغییر دور پمپ بر عملکرد آن بررسی شد. با افزایش زاویه خروجی پره تا زاویه 26 درجه راندمان افزایش و پس از آن کاهش یافت و با تغییر زاویه خروجی پره از 5/22 به 31 درجه هد پمپ در حدود %23 افزایش داشت. با بررسی اثر تغییر دور پمپ مشاهده شد که هد با افزایش و یا کاهش دور متناسب و راندمان با کاهش دور نسبت به نقطه طرح کاهش و با افزایش دور تغییر محسوسی نداشت. در طی فرایند گذرا، یک بیشینه هد لحظه‌ای که در حدود %27 بیشتر از هد طراحی است مشاهده شد که تغییرات هد در طی فرایند گذرا شامل سه مرحله است. در مرحله اول هد به‌صورت خطی افزایش می‌یابد و در مرحله دوم یک بیشینه هد لحظه‌ای رخ می‌دهد، در آخرین مرحله منحنی هد تمایل به پایداری پیدا می‌کند.

کلیدواژه‌ها

عنوان مقاله [English]

Design of mixed flow pump and its numerical and parametric analysis using computational fluid dynamics

نویسندگان [English]

  • Mohammad Reza Rostami 1
  • Mehrdad Bazaz- zadeh 2
  • Mahmoud Rostami Varnousfaaderani 3
1 Master's degree, Malek Ashtar University of Technology, Tehran, Iran
2 Associate Professor, Malik Ashtar University of Technology, Tehran, Iran
3 Assistant Professor, Malik Ashtar University of Technology, Tehran, Iran
چکیده [English]

Mixed-flow pumps have a wide application, high efficiency and wide range of head changes. One of the most important issues in Mixed-flow pumps is transient operation. AS for the complexity of Mixed-flow pump geometry and complexity in simulation, especially in the transient state, transient flow analysis in Mixed-flow pump has been less discussed. In this paper, a Mixed-flow pump was designed using CFturbo software and analyzed during steady state and transient process using CFX software. To ensure the correctness of the numerical results, a validation was carried out that the numerical results were in good agreement with the Experimental results. two parametric studies including the effect of changing the blade outlet angle in four different angles in the steady state and two angles in the transient state and the effect of changing the pump rotational speed on its performance were investigated. The efficiency with the increase of blade exit angle up to 26 degrees, the efficiency increased and then decreased, and by changing the blade outlet angle from 22.5 to 31 degrees, the pump head increases by about 23%. The head is proportional to the increase or decrease in speed and the efficiency decreased with the reduction of the rotational speed compared to the design point, and there was no significant change with the increase of the rotational speed compared to the design point. During the transient process, a maximum momentary pressure was observed which is about 27% higher than the design head. Pump head changes in this case are divided into three steps. In the first step, the head increases linearly, then in the second step, a momentary maximum pressure occurs, in the last step, the head curve tends to be stable.

کلیدواژه‌ها [English]

  • Mixed-flow pump
  • blade outlet angle
  • transient simulation
  • computational fluid dynamics

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https://creativecommons.org/licenses/by/4.0/

مراجع

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مکانیک سیالات و آیرودینامیک
دوره 12، شماره 2 - شماره پیاپی 32
پاییز و زمستان 1402
اسفند 1402
صفحه 129-140

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سابقه مقاله

  • تاریخ دریافت: 24 مهر 1402
  • تاریخ بازنگری: 01 دی 1402
  • تاریخ پذیرش: 10 بهمن 1402
  • تاریخ انتشار: 30 بهمن 1402

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