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بررسی اثر ایجاد یک شیار عمودی بر سطح پره‌های یک پروانه‌ی نیمه‌مغروق | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 7، دوره 56، شماره 6، شهریور 1403، صفحه 765-790 اصل مقاله (2.48 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2024.23088.7716 | ||
| نویسندگان | ||
| مجتبی برزگر رحیمی1؛ یاسین برزگر رحیمی2؛ محمود سالاری* 1 | ||
| 1گروه مهندسی مکانیک، دانشگاه جامع امام حسین (ع)، تهران، ایران | ||
| 2گروه مهندسی شیمی، دانشگاه گیلان، رشت، ایران | ||
| چکیده | ||
| پروانه‌ی نیمه‌مغروق نوعی از پروانههای دریایی است که در شناورهای تندرو از آن استفاده می‌شود. این پروانه مورد توجه طراحان قرار گرفته است؛ زیرا در اعداد کاویتاسیون نسبتا زیاد، دچار پدیده‌ی کاویتاسیون نمی‌شود. همچنین پروانههای نیمه‌مغروق در سرعت‌‌های بالا از پایداری رانشی و گشتاوری مناسبی برخوردار هستند و مانورپذیری بالایی هم دارند. از این رو بررسی بیشتر پیرامون آن، حائز اهمیت است. پژوهش پیش رو با هدف بررسی اثر ایجاد یک شیار عمودی بر سطح پره‌های یک پروانه‌ی نیمه‌مغروق انجام شده و ایده‌ی آن بر گرفته از سطح شیاردار یا کنگره‌دار در کفِ برخی شناورهای تندرو است. پروانه‌ی مورد بررسی در این پژوهش، پروانه‌ی نیمه‌مغروق 841-B موسوم به الفسون می‌باشد. شبکه‌بندی دامنه‌ی حل سه بعدی و شبیه‌سازی عددی در نرم‌افزار اِستار سی‌‌سی‌اِم انجام شده است. حالت مورد نظر در این شبیه‌سازی عددی، نسبت عمق غوطه‌وری 33%، ضریب پیشروی 0/8، عدد کاویتاسیون 2/3، عدد فرود 6 و زاویه‌ی صفر محور (حالت افقی) است. نتایج حاکی از آن است که بازدهی پروانه‌ی شیاردار 44/5% می‌باشد که این مقدار از بازدهی پروانه‌ی بدون شیار کمتر است. در انتها می‌توان گفت که شیار ایجاد شده، اثر نامطلوب بر بازدهی و عملکرد پروانه داشته و در عمل استفاده از آن در شرایط کاری پروانه‌ی مورد بررسی، توصیه نمی‌شود. | ||
| کلیدواژه‌ها | ||
| پروانه‌ی نیمه‌مغروق شیاردار؛ 841-B؛ شبیه‌سازی عددی؛ اِستار سی‌‌سی‌اِم | ||
| عنوان مقاله [English] | ||
| Investigating the effect of creating a vertical groove on the surface of a semi-submerged propeller blades | ||
| نویسندگان [English] | ||
| Mojtaba Barzegar Rahimi1؛ Yasin Barzegar Rahimi2؛ mahmoud salari1 | ||
| 1Department of Mechanical Engineering, Faculty of Engineering, Imam Hossein University, Tehran, Iran | ||
| 2B.Sc. Student in Chemical Engineering, Faculty of Technical Engineering, Guilan University, Rasht, Iran | ||
| چکیده [English] | ||
| The semi-submerged propeller is a type of marine propeller that is used in high-speed vessels. This propeller has attracted designer's attention; because it resists the destructive phenomenon of cavitation. Also Semi-submerged propellers have suitable thrust and torque stability at high speeds and offer high maneuverability. Therefore, further investigation around it is important. The current research aims to examine the effect of creating a vertical groove on the surface of the blades of a semi-submerged propeller, an idea inspired by the grooved or corrugated surface on the bottom of some high-speed vessels. The propeller examined in this study is the semi-submerged propeller 841-B known as Olofsson. The 3D domain meshing and numerical simulation have been done in the Star CCM software. The specific condition considered in this numerical simulation is a submergence depth ratio of 33%, an advance coefficient of 0.8, a cavitation number of 2.3, a Froude number of 6, and a shaft angle of zero degrees (horizontal position). The results showed that the efficiency of the grooved propeller is 44.5%, which is less than the efficiency of the ungrooved propeller. In the end, it can be said that the created groove has an adverse effect on the efficiency and performance of the propeller and it is not recommended to use it in the working conditions of the investigated propeller. | ||
| کلیدواژه‌ها [English] | ||
| Grooved Semi-Submerged Propeller, 841-B, Numerical Simulation, Star CCM | ||
| مراجع | ||
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