Numerical Simulation of Helicopter Rotor Performance Degradation in Natural Rain Encounter

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left"><svg height="8.68572pt" id="M182" style="vertical-align:-0.0498209pt" version="1.1" viewbox="-0.0498162 -8.6359 19.4248 8.68572" width="19.4248pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M743 375C743 570 607 650 407 650H136L130 622C214 612 220 606 204 526L125 122C110 43 105 36 24 27L17 0H250C382 0 482 23 571 76C680 141 743 248 743 375ZM644 379C644 188 520 36 305 36C277 36 249 38 229 46C205 55 202 71 212 126L293 553C300 588 306 600 317 606C330 613 356 617 390 617C547 617 644 537 644 379Z"></path></g><g transform="matrix(.013,0,0,-0.013,9.306,0)"><path d="M748 650H522L515 622L546 617C580 611 587 604 565 575C518 513 469 451 419 393C376 474 349 534 330 580C318 609 325 612 361 618L383 622L392 650H151L144 622C214 616 224 612 257 543L360 327C270 218 187 124 159 95C106 40 92 34 26 28L17 0H252L259 28L236 31C189 37 188 47 209 78C249 136 308 210 377 294L478 79C494 44 487 37 449 32L418 28L409 0H673L680 28C596 34 591 39 554 116L436 361C526 469 574 521 604 553C659 612 669 614 739 622L748 650Z"></path></g></svg> (knots)</td><td class="align_center">Clean</td><td class="align_center">Rain</td><td class="align_center">Del</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">0</td><td class="align_center">73.25</td><td class="align_center">53.91</td><td class="align_center">-26.39%</td></tr><tr><td class="align_left">40</td><td class="align_center">68.26</td><td class="align_center">50.62</td><td class="align_center">-25.85%</td></tr><tr><td class="align_left">80</td><td class="align_center">65.14</td><td class="align_center">48.72</td><td class="align_center">-25.21%</td></tr><tr><td class="align_left">120</td><td class="align_center">62.78</td><td class="align_center">47.70</td><td class="align_center">-24.02%</td></tr><tr><td class="align_left">160</td><td class="align_center">52.19</td><td class="align_center">40.11</td><td class="align_center">-23.14%</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Averaged lift-to-drag ratio of the UH-60A helicopter rotor disk.</div>

International Journal of Aerospace Engineering

tab3

Table 3

Table 3: Numerical Simulation of Helicopter Rotor Performance Degradation in Natural Rain Encounter 