We investigate a flow in a flat vortez chamber in which the distance between the end walls is smaller than the radius of the chamber. The study was mainly performed by optical methods: a TSpler device was employed, with the Foucault knife replaced by a diaphragm. It is shown that the flow in the chamber has a complicated spatial structure. In addition to the basic helical flow, an intense "transverse" rotation of the type of Taylor-Gb'rtler vortices occurs. In contrast to previously studied flows, where these vortices were observed near a concave surface, in the motion considered transverse vortices occur in the entire working volume of the chamber. In this case, four parallel vortex filaments are formed. The high intensity of the vortices has allowed one to visualize them by the Tiipler method and by "tinting" the flow by highly disperse particles. Quantitative dependences of the dimensions of the vortex cells on the flow regime, i.e., on the pressure of gas deceleration, were obtained.Regularities of the motion of a gas that is tangentially injected into a flat chamber with a central inlet were studied experimentally and theoretically in [1][2][3][4][5][6]. In these studies, a certain "averaged" motion is considered that can presumably be represented as a potential vortex with a certain vortex constituent beyond the boundary layers and the regions adjacent to the inlet and outlet channels.In this paper, we give results of a detailed study of the indicated motions in a chamber with central and tangential outlets. The flows considered are shown to have a complicated structure, and it is shown that the main vortex is superimposed by transverse vortices of the Taylor-G6rtler type [3][4][5].To study the motion of a gas and solid particles, we created a stand (Fig. 1) that includes a cylindrical vortex chamber 1 (h ~ = h/R = 0.45, where h is the height of the cylinder and R is its radius) with transparent end walls, a complex of optical equipment 2-4, meters of acoustic signals 5, oscillographs, spectral analyzers 6, a PC, a pneumatic system, an illuminating system, and a system of power supply. The flow studies were carried out in working chambers of different dimensions (R ~< 125 mm), but all the chambers were geometrically similar. In the process of operation of the device, compressed air was fed into the chamber through a contracting nozzle 7 of rectangular transverse cross section (SOn = Sin~So = 0.013, where Sin is the area of the inlet nozzle and So = ~rR 2 is the cross-sectional area of the chamber) along the tangent to the generatrix of the inner cylindrical surface, i.e., the gas is fed tangentially. There is a circular contoured hole 8 in the middle of the chamber in one of its end walls (S o = So~So = 0.05, where Sc is the area of the central hole) that connects the internal volume of the chamber with the atmosphere. In addition to the central hole, there is a deflecting nozzle 9 that is shifted relative to the inlet nozzle by 90 ~ streamwise (Fig. i) and whose geometry and method of connection to the cha...