Effects of manufacturing defects on the cavitation performance of a propeller blade section were studied using 3-D steady RANS solvers. Numerical simulations were carried out for the modified NACA-66 (a = 0.8, f/c = 0.014, t/c = 0.0416) foils. One foil was without defect and others had defects near the leading edge (LE). Convergence studies were performed for the foils of 0.525 m span to examine the sensitivity of solutions to domain size, grid aspect ratio, and first-grid spacing, <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40868_2024_156_Article_IEq1.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">$y^+$</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>y</mi> <mo>+</mo> </msup> </math></EquationSource> </InlineEquation>. Various turbulence models, including the Spalart–Allmaras model, the standard <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40868_2024_156_Article_IEq2.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="42" /> </InlineMediaObject> <EquationSource Format="TEX">$k-\varepsilon$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>k</mi> <mo>-</mo> <mi>ε</mi> </mrow> </math></EquationSource> </InlineEquation>, the standard <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40868_2024_156_Article_IEq3.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="44" /> </InlineMediaObject> <EquationSource Format="TEX">$k-\omega$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>k</mi> <mo>-</mo> <mi>ω</mi> </mrow> </math></EquationSource> </InlineEquation>, and the SST <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40868_2024_156_Article_IEq4.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="44" /> </InlineMediaObject> <EquationSource Format="TEX">$k-\omega$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>k</mi> <mo>-</mo> <mi>ω</mi> </mrow> </math></EquationSource> </InlineEquation> models, were used, and their effects on the solutions were examined. The cavitation buckets in terms of cavitation number, the reduction of cavitation inception speed, and the efficiency due to LE defect were studied. The results show that defects close to LE narrow the cavitation bucket in the typical design range of angle of attack. As a consequence, a section with a defect would experience cavitation at a lower speed than the section without a defect.

Effects of leading-edge manufacturing defects on cavitation performance of foils

期刊论文
发表日期：

2025年1月21日

查看全文

Shanqin Jin,
Heather Peng,
Wei Qiu,
Slobodan Gospodnetic

摘要

Effects of manufacturing defects on the cavitation performance of a propeller blade section were studied using 3-D steady RANS solvers. Numerical simulations were carried out for the modified NACA-66 (a = 0.8, f/c = 0.014, t/c = 0.0416) foils. One foil was without defect and others had defects near the leading edge (LE). Convergence studies were performed for the foils of 0.525 m span to examine the sensitivity of solutions to domain size, grid aspect ratio, and first-grid spacing, $y^+$ $y^{+}$ . Various turbulence models, including the Spalart–Allmaras model, the standard $k-\varepsilon$ $k - ε$ , the standard $k-\omega$ $k - ω$ , and the SST $k-\omega$ $k - ω$ models, were used, and their effects on the solutions were examined. The cavitation buckets in terms of cavitation number, the reduction of cavitation inception speed, and the efficiency due to LE defect were studied. The results show that defects close to LE narrow the cavitation bucket in the typical design range of angle of attack. As a consequence, a section with a defect would experience cavitation at a lower speed than the section without a defect.