Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 32, No. 1 (January 2019) 106-111    Article in Press

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  FOIL APPLICATION TO REDUCE RESISTANCE OF CATAMARAN UNDER HIGH SPEEDS AND DIFFERENT OPERATING CONDITIONS
 
H. Kazemi moghadam, R. Shafaghat and A. Hajiabadi
 
( Received: June 11, 2018 – Accepted in Revised Form: January 03, 2019 )
 
 

Abstract    Today, researchers exploit hybrid craft more than they used to be. The main reason is that they need to high speed as well as extra portability. For instance, a famous hybrid craft is named Hysucat, was designed through the combination of catamaran and hydrofoil. Catamarans, a type of multihull boats, have always considered by designers because of their simultaneous supply of high speed and stability. These boats hold high drag despite more wetted surface as well. By using hydrofoil the wetted surface reduces, and then the drag of boat will decline. Meanwhile, sketches in the layout of hydrofoil processes notice to weight and center of gravity. This paper investigated application of hydrofoil in the high speed catamaran with considering different conditions in terms of center of gravity and load conditions. The model has exploited in the three states of loading (partial, ballast and over) and two centers of gravity for each diverse weight. Hence, nine series tests in towing tank have been carried out on the model boat in scale 1 ratio to 11.43. Eventually, results were computed to full scale boat by Froude number and ITTC model. According to the test results, usage of the hydrofoil brings about 50% drag reduction.

 

Keywords    Catamaran, Hydrofoil, Load Conditions, Towing Tank, Drag Reduction

 

چکیده   

امروزه، نیاز به سرعت بالا و نیز قابلیت حمل بار بیشتر محققین را به سمت استفاده از شناورهای ترکیبی سوق داده است. شناور هایسوکت یکی از انواع شناورهای ترکیبی است که با ترکیب شناور کاتاماران و هیدروفویل طراحی شده است. شناورهای کاتامارن به عنوان نوعی از شناورهای چند بدنه، به خاطر تامین همزمان سرعت بالا و پایداری مناسب، همواره مورد توجه طراحان و کاربران شناورهای تندرو بوده‌اند. این شناورها با وجود سطح ترشده بیشتر درگ بالاتری نیز دارند که با بکارگیری هیدروفویل سطح ترشده شناور کمتر شده سبب کاهش درگ شناور می‌شود. طراحی سیستم هیدروفویل با توجه به وزن و مرکز جرم شناور صورت می‌گیرد. در این مطالعه به بررسی استفاده از هیدروفویل در یک شناور کاتاماران تندرو در شرایط بار و مرکز جرم متفاوت پرداخته شده است. مدل در سه حالت بارگذاری گوناگون ( بار سبک، بار کامل و بار سنگین) و دو مرکز جرم برای هر وزن بررسی شده است. بدین منظور 9 سری کامل تست در حوضچه کشش بر روی شناور مدل با مقیاس 1 به 43/11 صورت گرفت و در نهایت نتایج برای شناور اصلی با استفاده از مدل فرود و ITTC ارائه شد. با توجه به نتایج تست، استفاده از سیستم هیدروفویل با عث کاهش درگ تا 50% می‌شود. در حالت بار سبک مرکز جرم جلوتر و در حالت بار سنگین مرکز جرم عقب‌تر مطلوب است.

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