Unsteady Pressure Measurements On 1 :40 Scale GSLV HeatShield Model

Wind tunnel measurements were carried out on a 1:40 scale model of GSLV configuration to measure unsteady pressures in the heat shield region of the model in the 1.2m tunnel at NAL. This document gives a brief description of the experiments highlighting several techniques adopted to obtain accurate unsteady pressure data. Typical results on steady and unsteady pressure distribution are briefly discussed . Pressure fluctuation levels are highest near the reattachment point. Spectra are generally of broadband type without any dominant peak and nearly 80 to 90% of the energy of pressure fluctuation was contained within 0-5KHz of frequency range.