Advective disturbances in combustor thermoacoustics

Multi-stage Traveling Wave Thermoacoustics in Practice

Advective Disks

Recent work on advection-dominated accretion flows (ADAFs) is reviewed. The article concentrates on an optically thin branch of ADAFs which is present at mass accretion rates below a critical value ∼ (10 −2 − 10 −1) the Eddington rate. Models based on this branch have been quite successful at explaining a number of low-luminosity X-ray bi-naries and galactic nuclei, and some brighter systems. S...

Advective transport in percolation clusters.

We simulate advective transport in bond percolation clusters at the critical point. We compute the histogram of flow speeds in each bond of the backbone and find the multifractal spectrum for two-dimensional lattices with linear dimension L2000 and in three dimensions for L250 . We demonstrate that in the limit of large systems all the negative moments of the velocity distribution become ill-de...

A Transfer Function Representation of Thermo-Acoustic Dynamics for Combustors

In this paper, we present a transfer function representation of a general one-dimensional combustor. The input of the transfer function is a heat rate perturbation of a burner and the output is a flow velocity perturbation at the burner. This paper considers a general combustor model composed of multiple cans with different cross sectional areas, along with a non-zero flow rate. Keywords—Thermo...

Scramjet Combustor Development.pdf

An airframe integrated scramjet propelled vehicle has advantages for application to several missions. In its simplest form, such a vehicle will combine the features of quick reaction, low vulnerability to counter attack and better propulsion efficiency. The Supersonic Combustion Ramjet (SCRAMJET) engine has been recognized as the most promising air breathing propulsion system for the hypersonic...