The reason why you don't get reply from HR.. Think of this way..

If the HR sent a rejection letter to you.. imagine what happens when the hiring manager decided to pursue their interest with you? Isn't it a bit paiseh to retract rejection? Not professional at all to do so.

Unless there is a solid base you don't qualify for the role at all, then yes, they will send rejection. Most of the time, HR treat you as suitable candidate.