توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Application of Composite Compliant Coating for Turbulent Flow Drag Reduction
نویسنده(ها): ، ،
اطلاعات انتشار: ششمین همایش ملی صنایع دریایی ایران، سال
تعداد صفحات: ۱۰
We have designed a new type of flexible surface and simulate the interaction of this surface with a near–wall turbulent flow. This coating is constructed by combined together both members in tension and members in compression to form a plate – network structure, then covering this deiscrete flexible structure with a continous memberan. We have modeled the flow interaction by coupling a Direct Numerical simulation (DNS) code resolving the turbulent flow. An moving boundary Method (MBM) is used to capture the effect of the moving boundary in the DNS . Our ultimataim is to use this new simulation tool to design of the coating<\div>

۲Investigation the Effects of Compliant Coating on Drag Reduction and Prevent Cavitation Damage by Experimental method
نویسنده(ها): ، ، ،
اطلاعات انتشار: هشتمین همایش ملی صنایع دریایی ایران، سال
تعداد صفحات: ۱۱
The drag coefficients on discs rotating in a cylindrical tank has studied in relation to the nature of a composite coating attached to the underside of the disc, and direct comparisons were made with refrence discs of identical geometry which were completely rigid. The composite coating was formed by: (1) bondig of velvet fabric to the metal disc with velour face outward, (2) casting a premixed silicone composition over the velvet
fabric, (3) covering the silicone layer with a thin, stiff polymer film.As a result of the tests in certain cases drag coefficient was reduced by 20% or more as compared to refrence rigid discs. Two conclusions are possible: (1)True reduction of energy exchange in the turbulent boundary layer was achived, perhaps by damping of the turbulent bursting process ; (2) A significant increase in the laminar region at the center of disc was obtainded (transition of laminar to turbulent delayed). The stiffness of the top film influenced the performance of the coating. The change of drag
coefficient of discs to be strongly influenced by the dynamic mechanical properties of the silicone elastomer network. In the next experiments, was observed that cavitation at rotatinge disc in the cylinder tank and also hydrofoil in water tunnel, both with compliant coating, was incepted
later as compared with identical reference solid that.<\div>

۳EXPERIMENTAL METHOD FOR DRAG REDUCTION BY COMPLIANT COATING
نویسنده(ها): ، ،
اطلاعات انتشار: یازدهمین همایش ملی صنایع دریایی ایران، سال
تعداد صفحات: ۷
The drag coefficients on discs rotating in a cylindrical tank has studied relation to the nature of a composite coating attached to the underside of the disc, and direct comparisons were made with refrence discs of identical geometry which were completely rigid. The composite coating was formed by: (1) bonding of velvet fabric to the metal disc with velour face outward, (2) casting a premixed silicone composition over the velvet fabric, (3) covering the silicone layer with a thin , stiff polymer film. As a result of the tests in certain cases drag coefficient was reduced by 20% or more as compared to refrence rigid discs. Two conclusions are possible: (1) True reduction of energy exchange in the turbulent boundary layer was achived , perhaps by damping of the turbulent of bursting process; (2) A significant increase in the laminar region at the center of disc was obtainded (transition of laminar to turbulent delayed) . The stiffness of the top film influenced the performance of the coating. The change of drag coefficient of discs to be strongly influenced by the dynamic mechanical properties of the silicone elastomer network<\div>
نمایش نتایج ۱ تا ۳ از میان ۳ نتیجه