Wind tunnel experiment on windproof effect of double-row nylon sand-blocking net-grass square combination
To study the windproof effect of double-row nylon sand-blocking net-grass square combination,wind tunnel experiments of double-row nylon sand-blocking net-grass square lattice with porosity of 40%,45%,and 55%were carried out,and the contours of wind acceleration rate,windproof efficacy,and wind contour indexes were investigated under the three kinds of wind speeds,namely,6,10 m·s-1 and 14 m·s-1.The results show that:(1)Under different wind speed conditions,the windproof effect of double-row nylon sand-blocking net-grass combination decreases significantly with the increase of the incoming wind speed.(2)The windproof effect of the combined use of double-row nylon sand-blocking net-grass squares using a porosity of 40%is relatively bet-ter,whereas the windproof effect is relatively poorer when using a porosity of 45%,and the worst is found in the case of the windproof effect of porosity of 55%.(3)There is a cumulation of windproof effects in the combined application of double-row nylon sand-blocking net-grass squares.Therefore,it is recommended that a 40%poros-ity double-row nylon sand-blocking net-grass square grid be used in combination with practical applications to obtain the best wind protection effect.