Released: 26.4.2023, 12:15 -- Updated: 10.5.2023, 10:48

Painemaksimi ~ 14.5.2023, 20:00

Unsteady heat release rate, such as arises from unsteady fuel combustion, leads to unsteady volume expansion. This acts as an acoustic ‘‘monopole’’ source, generating acoustic waves  known as ‘‘direct combustion noise.’’ Unsteady heat release rate also generates temperature variations, known as ‘‘hot spots’’ or entropy waves, which may eventually go on to generate entropy noise. Entropy waves advect with the local flow velocity – they are swept downstream with the flow. In a non-accelerating flow, it is known that linear flow fluctuations can be decomposed into acoustic, entropy and vorticity waves, which do not interact. This means that the entropy waves are silent. However, when entropy waves are accelerated, regions of fluid with different densities undergo a volume contraction, as shown  diagrammatically in Figure 1. This invokes a fluctuating force, which acts as an acoustic ‘‘dipole’’ – a second source of noise. It is this second noise source, resulting from entropy wave acceleration, that is known as ‘‘entropy noise’’ or ‘‘indirect combustion noise.

Entropy noise: A review of theory, progress and challenges Aimee S Morgans and Ignacio Duran

In the midst of the Audio Engineering Convention, Entropy is prepared to offer a pure experience of a well known audio concept: the pressure maximum. Maximum pressure nodes are created through the constructive interference of sound waves and result in a strong amplification of the sound. Are you ready to stay in the maximum pressure bass all throughout the night?

In this event, Entropy noise presents the experience of maximum nodes in three spaces:

• Maximun Sound Pressure Node: Rave room
• Maximum Temperature Node: Ambient Sauna
• Maximum Dialogue Node: Cocktail Party room

Bring your dance shoes for the loud and fast rave room, a towel for the hot steam ambient sauna and come meet your fellows in the cocktail party node.

Location: Otakaari 20, Espoo

 

DJ Artists @ Lounge Room

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DJ Artists @ Rave Room

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