a method of delivering a purge flow through a gas turbomachine includes generating a purge flow , guiding the purge flow through at least one of a combustor assembly and a turbine portion of the gas turbomachine , determining a cumulative purge volume passing through the one of the combustor assembly and the turbine portion of the gas turbomachine to determine a predetermined purge volume , and discontinuing the purge flow once the predetermined purge volume has passed through the one of the combustor assembly and the turbine portion of the gas turbomachine .