Tube termination conditions determine which harmonics a wind instrument produces

Evidence

In a tube of finite length, the terminations reflect waves back so that standing waves appear, resulting in modes and resonance frequencies. … The first case is approximated, for example, in the flute, generating all harmonics, and the second case in the clarinet, where (low order) even harmonics are weak due to lack of resonance. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 242

Categorization

• XREF: This explains why clarinet and flute timbres differ audibly — ties to perception of instrument families.