A theoretical investigation on the combustion behavior of nano-aluminum (nAl) and liquid water is conducted. Linear burning rates of nAl and liquid water as a function of pressure and equivalence ratio are reported. A 38-nm diameter aluminum particle with a 3.1-nm thick oxide layer has been chosen for the present study. The simulation is carried out for a pressure range of 0.1 - 3.65 MPa. The equivalence ratio considered in the present study varies from 0.5 to 1.25. The model predicts an increase in linear burning rate from 0.7 to 8.1 cm/s at a pressure of 3.65 MPa, as the equivalence ratio is increased from 0.5 to 1.25. The predicted burning rates are in good agreement with the experimentally measured values. The flame thickness predicted by the model is 108 microns.