Research On The Effect Of Airflow Disturbance On The Firing Accuracy Of 155mm High Bore Pressure Artillery

The disturbance of airflow has a very important impact on the accuracy of artillery fire,especially the complex low-altitude wind shear,which not only affects the range and lateral deflection distance of artillery projectiles,but also has a great impact on the flight height and blast height of projectiles.In this paper,two types of low-altitude wind shear airflow are constructed to study the effect of low-altitude wind shear airflow on the accuracy of artillery fire,analyze its effect on the external trajectory of artillery,and establish an artillery projectile drop correction system and compare and analyze its experimental data.In view of the characteristics of mountain low-level shear airflow,this paper establishes multiple mountain low-level shear airflow models based on the mountain potential flow theory,and uses four different mountain terrain as the basis of the study,and analyzes the deviation of external ballistics of artillery under different mountain conditions with different initial airflows,different firing angles and different firing positions by combining 6-degree-of-freedom ballistic models.By comparing and analyzing the experimental data,the initial horizontal airflow has a greater influence on the transverse deviation produced by the external ballistics,and the proportion of the deviation amount is about 484 % relative to the windless ballistics when the experimental wind speed reaches 15 m/s;the range of the projectile fired at the leeward slope is smaller than the firing distance at the windward slope,and the distance is reduced by 5.73%;with the increase of the firing angle,the increase of the ballistic height accounts for 23.99% of the previous item,respectively with the increase of the shooting angle,the increase of the ballistic height was 23.99%,23.02%,19.65%,and the increase of the pitch angle was 10.11%,18.22%,and 23.01%,respectively,showing an increasing but decreasing trend.For the characteristics of the wet micro-strike storm airflow,this paper establishes a theoretical model of micro-strike storm airflow based on the vortex ring principle,and fuses the two by equivalent substitution based on the theoretical model of hydrodynamic raindrop motion,and combines the fused wet micro-strike storm airflow model with the 6-degree-of-freedom external ballistic model of artillery.For long-range strikes,the change of induced velocity and the effect of airflow on the ballistic range are positively correlated,and the range is reduced by about 2.7% at an induced velocity of 10 m/s compared with the range in windless environment,and the range is reduced by about 1.3% for every 5 m/s increase of induced velocity,which seriously affects the accuracy and killing effect of the artillery.Finally,based on Newton’s iteration method and vector angle formula,a correction algorithm for the artillery firing angle and firing direction angle is established.In order to verify the feasibility of the method,the mountain low-level shear airflow model is introduced into the6-degree-of-freedom ballistic model and simulated in this paper,and the results obtained after five iterations of calculation to obtain the results and set the target point coordinates for comparison,the correction of the shot angle is 2.455 °,the range and lateral offset distance and the target point The difference in coordinates between the range and lateral offset and the target point are 0.1425 m and 3.5115 m respectively,which are less than the iterative error values to meet the requirements of accurate artillery strike.