Experimental and numerical investigations of a bluff body stabilized flame have been carried out. Here, the fuel is injected a short distance upstream of the bluff body within the combustor, as is the case in practical ramjets and afterburners. In this situation, both the mixing of the fuel and air as well as the subsequent combustion stabilized at the bluff body are altered by the acoustic field excited by unsteady heat release in the combustion zone. The present study focuses on the acoustic spectra for this geometry for different combustor configurations. These configurations correspond to different axial locations of the bluff body and different lengths of the combustor. The result shows that blowout occurs at higher equivalence ratio, particularly for longer combustor and the bluff body located closer to the inlet. Comparison of dominant frequencies obtained for this case shows that there is no spatial variation in the dominant frequency for different inlet air velocities. For shorter combustor with the bluff body located closer to the exit, different locations along the combustor exhibit different dominant frequencies which can be identified as being either of two distinct modes. The variation of dominant amplitude with fuel flow rate shows that the maximum amplitude obtained is higher for the higher fuel flow rate for all the configurations tested. Cold flow PIV measurements clearly shows the alternating pair of vortices in the recirculation zone downstream of the V-gutter. Numerical simulations of the cold flow in the bluff body combustor have been carried out using the commercial software FLUENT for selected configurations. The main objective is to determine how well numerical simulations are able to predict the dominant frequencies of the unsteady flow field. Realizable k - ε model has been used for modelling turbulence. Second order accurate spatial as well as temporal discretization has been used. DFT of the pressure-time data have been performed to extract the dominant frequencies of the oscillations. It is seen that the numerical calculations are able to predict the dominant frequencies quite well.