Considerations for Estimating Bow Shock Stand-Off Distance in Cold Spray Supersonic Jet Impingement

Abstract This work specifically focuses on time-averaged centerline bow shock standoff distance (Δ) which serves as a simple descriptor of the complex impinging jet flow field. Synthesis of physical and computational experiments conclusively demonstrates that a commonly cited correlation in cold spray literature involving Δ is quantitatively valid for the case of supersonic flow over stationary spheres, which is the situation for which this correlation was specifically developed. However, the present work shows that this correlation is quantitatively and qualitatively invalid for supersonic jet impingement flows relevant to CS.