The pilot encountered a downdraft during his approach. The airplane touched down hard and bounced. After bouncing down the runway twice, the pilot decided to abort the landing and maneuvered the airplane back into the traffic pattern for the same runway. He landed without incident. Upon exiting the airplane, he noted the propeller had struck the runway on his first landing attempt. The airplane sustained damage to the firewall. The pilot reported that there were no pre-impact mechanical malfunctions or failures that would have precluded normal operation.